Adds add'l docs regarding delete_on_termination

This PR adds documentation pointing out that volumes are not by
default deleted on termination of any AWS EC2 instance during a
packer build.

website/Makefile

@@ -13,5 +13,5 @@ format:
 	bundle exec htmlbeautifier -t 2 source/*.erb
 	bundle exec htmlbeautifier -t 2 source/layouts/*.erb
 	@pandoc -v > /dev/null || echo "pandoc must be installed in order to format markdown content"
-	pandoc -v > /dev/null && find . -iname "*.html.md" | xargs -I{} bash -c "pandoc -r markdown -w markdown --tab-stop=4 --atx-headers -s --columns=80 {} > {}.new"\; || true
+	pandoc -v > /dev/null && find . -iname "*.html.md*" | xargs -I{} bash -c "pandoc -r markdown -w markdown --tab-stop=4 --atx-headers -s --columns=80 {} > {}.new"\; || true
-	pandoc -v > /dev/null && find . -iname "*.html.md" | xargs -I{} bash -c "mv {}.new {}"\; || true
+	pandoc -v > /dev/null && find . -iname "*.html.md*" | xargs -I{} bash -c "mv {}.new {}"\; || true

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

@@ -122,18 +122,19 @@ each category, the available configuration keys are alphabetized.
     `ec2:ModifyInstanceAttribute` to your AWS IAM policy.
 
 -   `force_deregister` (boolean) - Force Packer to first deregister an existing
-    AMI if one with the same name already exists. Default false.
+    AMI if one with the same name already exists. Default `false`.
 
 -   `from_scratch` (boolean) - Build a new volume instead of starting from an
-    existing AMI root volume snapshot. Default false. If true, `source_ami` is
+    existing AMI root volume snapshot. Default `false`. If true, `source_ami` is
     no longer used and the following options become required:
     `ami_virtualization_type`, `pre_mount_commands` and `root_volume_size`. The
     below options are also required in this mode only:
 
-    -   `ami_block_device_mappings` (array of block device mappings) An entry
+    -   `ami_block_device_mappings` (array of block device mappings) - Add the block
-        matching `root_device_name` should be set. See the
+    device mappings to the AMI. A `device_name` entry matching `root_device_name`
-        [amazon-ebs](/docs/builders/amazon-ebs.html) documentation for more
+    should be set. The block device mappings allow for keys:
-        details on this parameter.
+
+        <%= partial "partials/builders/ami-block-device-mappings" %>
 
     -   `root_device_name` (string) - The root device name. For example, `xvda`.
 
@@ -170,7 +171,7 @@ each category, the available configuration keys are alphabetized.
     this field must be defined.
 
 -   `skip_region_validation` (boolean) - Set to true if you want to skip
-    validation of the `ami_regions` configuration option. Defaults to false.
+    validation of the `ami_regions` configuration option. Default `false`.
 
 -   `source_ami_filter` (object) - Filters used to populate the `source_ami` field.
     Example:

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

@@ -174,7 +174,7 @@ builder.
     `security_group_id`.
 
 -   `skip_region_validation` (boolean) - Set to true if you want to skip
-    validation of the region configuration option.  Defaults to false.
+    validation of the region configuration option.  Default `false`.
 
 -   `source_ami_filter` (object) - Filters used to populate the `source_ami` field.
     Example:
@@ -359,3 +359,4 @@ up all residual volumes that are not designated by the user to remain after
 termination. If you need to preserve those source volumes, you can overwrite the
 termination setting by specifying `delete_on_termination=false` in the
 `launch_block_device_mappings` block for the device.
+

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

@@ -189,7 +189,7 @@ builder.
     `security_group_id`.
 
 -   `skip_region_validation` (boolean) - Set to true if you want to skip
-    validation of the region configuration option.  Defaults to false.
+    validation of the region configuration option.  Default `false`.
 
 -   `source_ami_filter` (object) - Filters used to populate the `source_ami` field.
     Example:

website/source/partials/builders/_ami-block-device-mappings.html.md

@@ -0,0 +1,33 @@
+-   `delete_on_termination` (boolean) - Indicates whether the EBS volume is
+    deleted on instance termination. Default `false`. **NOTE**: If this
+    value is not explicitly set to `true` and volumes are not cleaned up by
+    an alternative method, additional volumes will accumulate after
+    every build.
+
+-   `device_name` (string) - The device name exposed to the instance (for
+     example, "/dev/sdh" or "xvdh"). Required when specifying `volume_size`.
+
+-   `encrypted` (boolean) - Indicates whether to encrypt the volume or not
+
+-   `iops` (integer) - 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
+
+-   `no_device` (boolean) - Suppresses the specified device included in the
+    block device mapping of the AMI
+
+-   `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
+
+-   `volume_size` (integer) - The size of the volume, in GiB. Required if 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
+