Merge pull request #3133 from rickard-von-essen/aws_ssh_cleanup

Amazon: Cleaned up the docs about SSH after implementing Communicator.

website/source/docs/builders/amazon-ebs.html.markdown

@@ -167,8 +167,9 @@ builder.
 
 -   `ssh_keypair_name` (string) - If specified, this is the key that will be
     used for SSH with the machine. By default, this is blank, and Packer will
-    generate a temporary keypair. `ssh_private_key_file` must be specified
-    with this.
+    generate a temporary keypair.
+    [`ssh_private_key_file`](/docs/templates/communicator.html#ssh_private_key_file)
+    must be specified with this.
 
 -   `ssh_private_ip` (boolean) - If true, then SSH will always use the private
     IP if available.

website/source/docs/builders/amazon-instance.html.markdown

@@ -206,17 +206,13 @@ builder.
 -   `ssh_keypair_name` (string) - If specified, this is the key that will be
     used for SSH with the machine. The key must match a key pair name loaded
     up into Amazon EC2.  By default, this is blank, and Packer will
-    generate a temporary keypair.  `ssh_private_key_file` must be specified
-    when `ssh_keypair_name` is utilized.
+    generate a temporary keypair.
+    [`ssh_private_key_file`](/docs/templates/communicator.html#ssh_private_key_file)
+    must be specified when `ssh_keypair_name` is utilized.
 
 -   `ssh_private_ip` (boolean) - If true, then SSH will always use the private
     IP if available.
 
--   `ssh_private_key_file` (string) - Is required if `ssh_keypair_name` is
-    specified.  This is the name of a private SSH key file located on the
-    same machine running packer so the packer scripts can SSH into the machine
-    being created (eg. - /home/mitchellh/.ssh/id_rsa).
-
 -   `subnet_id` (string) - If using VPC, the ID of the subnet, such as
     "subnet-12345def", where Packer will launch the EC2 instance. This field is
     required if you are using an non-default VPC.