Docs: Formatting, fixes, nits, and improvements to the ebsvolume builder doc

* Fix or remove references to AMI creation copied in from other docs
* Remove unsupported `snapshot_users` and `snapshot_groups` options

website/source/docs/builders/amazon-ebsvolume.html.md.erb

@@ -1,7 +1,7 @@
 ---
 description: |
-    The amazon-ebsvolume Packer builder is like the EBS builder, but is intended to
+    The amazon-ebsvolume Packer builder is like the EBS builder, but is
-    create EBS volumes rather than a machine image.
+    intended to create EBS volumes rather than a machine image.
 layout: docs
 page_title: 'Amazon EBS Volume - Builders'
 sidebar_current: 'docs-builders-amazon-ebsvolume'
@@ -14,9 +14,11 @@ Type: `amazon-ebsvolume`
 The `amazon-ebsvolume` Packer builder is able to create Amazon Elastic Block
 Store volumes which are prepopulated with filesystems or data.
 
-This builder builds EBS volumes by launching an EC2 instance from a source AMI,
+This builder creates EBS volumes by launching an EC2 instance from a source
-provisioning that running machine, and then destroying the source machine,
+AMI. One or more EBS volumes are attached to the running instance, allowing
-keeping the volumes intact.
+them to be provisioned into from the running machine. Once provisioning is
+complete the source machine is destroyed. The provisioned volumes are kept
+intact.
 
 This is all done in your own AWS account. The builder will create temporary key
 pairs, security group rules, etc. that provide it temporary access to the
@@ -44,11 +46,11 @@ builder.
 -   `access_key` (string) - The access key used to communicate with AWS. [Learn
     how to set this.](/docs/builders/amazon.html#specifying-amazon-credentials)
 
--   `instance_type` (string) - The EC2 instance type to use while building the
+-   `instance_type` (string) - The EC2 instance type to use while creating
-    AMI, such as `m1.small`.
+    the EBS volumes, such as `m1.small`.
 
 -   `region` (string) - The name of the region, such as `us-east-1`, in which
-    to launch the EC2 instance to create the AMI.
+    to launch the EC2 instance to create the new EBS volumes.
 
 -   `secret_key` (string) - The secret key used to communicate with AWS. [Learn
     how to set this.](/docs/builders/amazon.html#specifying-amazon-credentials)
@@ -60,7 +62,7 @@ builder.
 ### Optional:
 
 -   `ebs_volumes` (array of block device mappings) - Add the block device
-    mappings to the AMI. The block device mappings allow for keys:
+    mappings to the running instance. The block device mappings allow for keys:
 
     -   `device_name` (string) - The device name exposed to the instance (for
         example, `/dev/sdh` or `xvdh`). Required for every device in the block
@@ -82,24 +84,24 @@ builder.
     -   `iops` (number) - The number of I/O operations per second (IOPS) that
         the volume supports. See the documentation on
         [IOPs](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_EbsBlockDevice.html)
-        for more information
+        for more information.
 
     -   `no_device` (boolean) - Suppresses the specified device included in the
-        block device mapping of the AMI
+        block device mapping of the AMI.
 
-    -   `snapshot_id` (string) - The ID of the snapshot
+    -   `snapshot_id` (string) - The ID of the snapshot.
 
     -   `virtual_name` (string) - The virtual device name. See the
         documentation on [Block Device
         Mapping](https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_BlockDeviceMapping.html)
-        for more information
+        for more information.
 
     -   `volume_size` (number) - The size of the volume, in GiB. Required if
-        not specifying a `snapshot_id`
+        not specifying a `snapshot_id`.
 
     -   `volume_type` (string) - The volume type. `gp2` for General Purpose
         (SSD) volumes, `io1` for Provisioned IOPS (SSD) volumes, and `standard`
-        for Magnetic volumes
+        for Magnetic volumes.
 
     -   `tags` (map) - Tags to apply to the volume. These are retained after
         the builder completes. This is a [template
@@ -108,7 +110,7 @@ builder.
 
 -   `associate_public_ip_address` (boolean) - If using a non-default VPC,
     public IP addresses are not provided by default. If this is `true`, your
-    new instance will get a Public IP. default: `false`
+    new instance will get a Public IP. Default: `false`.
 
 -   `availability_zone` (string) - Destination availability zone to launch
     instance in. Leave this empty to allow Amazon to auto-assign.
@@ -158,11 +160,9 @@ builder.
 
 -   `ena_support` (boolean) - Enable enhanced networking (ENA but not
     SriovNetSupport) on HVM-compatible AMIs. If set, add
-    `ec2:ModifyInstanceAttribute` to your AWS IAM policy. If false, this will
+    `ec2:ModifyInstanceAttribute` to your AWS IAM policy. Note: you must
-    disable enhanced networking in the final AMI as opposed to passing the
+    make sure enhanced networking is enabled on your instance. See
-    setting through unchanged from the source. Note: you must make sure
+    [Amazon's documentation on enabling enhanced
-    enhanced networking is enabled on your instance. See [Amazon's
-    documentation on enabling enhanced
     networking](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html#enabling_enhanced_networking).
 
 -   `enable_t2_unlimited` (boolean) - Enabling T2 Unlimited allows the source
@@ -206,8 +206,7 @@ builder.
     for more details.
 
 -   `run_tags` (object of key/value strings) - Tags to apply to the instance
-    that is *launched* to create the AMI. These tags are *not* applied to the
+    that is *launched* to create the EBS volumes. This is a [template
-    resulting AMI unless they're duplicated in `tags`. This is a [template
     engine](/docs/templates/engine.html), see [Build template
     data](#build-template-data) for more information.
 
@@ -250,16 +249,6 @@ builder.
 -   `skip_region_validation` (boolean) - Set to `true` if you want to skip
     validation of the region configuration option. Defaults to `false`.
 
--   `snapshot_groups` (array of strings) - A list of groups that have access to
-    create volumes from the snapshot(s). By default no groups have permission
-    to create volumes from the snapshot(s). `all` will make the snapshot
-    publicly accessible.
-
--   `snapshot_users` (array of strings) - A list of account IDs that have
-    access to create volumes from the snapshot(s). By default no additional
-    users other than the user creating the AMI has permissions to create
-    volumes from the backing snapshot(s).
-
 -   `source_ami_filter` (object) - Filters used to populate the `source_ami`
     field. Example:
 
@@ -376,9 +365,12 @@ builder.
     `packer_<UUID>`, where &lt;UUID&gt; is a 36 character unique identifier.
 
 -   `temporary_security_group_source_cidrs` (list of string) - A list of IPv4
-    CIDR blocks to be authorized access to the instance, when packer is creating a temporary security group.
+    CIDR blocks to be authorized access to the instance, when packer is
+    creating a temporary security group.
 
-    The default is [`0.0.0.0/0`] (i.e., allow any IPv4 source). This is only used when `security_group_id` or `security_group_ids` is not specified.
+    The default is [`0.0.0.0/0`] (i.e., allow any IPv4 source). This is
+    only used when `security_group_id` or `security_group_ids` is not
+    specified.
 
 -   `token` (string) - The access token to use. This is different from the
     access key and secret key. If you're not sure what this is, then you
@@ -551,4 +543,4 @@ volumes created by this builder, any volumes inn the source AMI which are not
 marked for deletion on termination will remain in your account.
 
 
-<%= partial "partials/builders/aws-ssh-differentiation-table" %>
+<%= partial "partials/builders/aws-ssh-differentiation-table" %>