clarify docs for encrypt_boot

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

@@ -142,7 +142,8 @@ each category, the available configuration keys are alphabetized.
 
 -   `encrypt_boot` (boolean) - Instruct packer to automatically create a copy of the
     AMI with an encrypted boot volume (discarding the initial unencrypted AMI in the
-    process). Default `false`.
+    process). Packer will always run this operation, even if the base
+    AMI has an encrypted boot volume to start with. Default `false`.
 
 -   `kms_key_id` (string) - The ID of the KMS key to use for boot volume encryption.
     This only applies to the main `region`, other regions where the AMI will be copied

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

@@ -179,7 +179,8 @@ builder.
 
 -   `encrypt_boot` (boolean) - Instruct packer to automatically create a copy of the
     AMI with an encrypted boot volume (discarding the initial unencrypted AMI in the
-    process). Default `false`.
+    process). Packer will always run this operation, even if the base
+    AMI has an encrypted boot volume to start with. Default `false`.
 
 -   `kms_key_id` (string) - The ID of the KMS key to use for boot volume encryption.
     This only applies to the main `region`, other regions where the AMI will be copied

website/source/docs/builders/amazon-ebssurrogate.html.md

@@ -172,7 +172,8 @@ builder.
 
 -   `encrypt_boot` (boolean) - Instruct packer to automatically create a copy of the
     AMI with an encrypted boot volume (discarding the initial unencrypted AMI in the
-    process). Default `false`.
+    process). Packer will always run this operation, even if the base
+    AMI has an encrypted boot volume to start with. Default `false`.
 
 -   `kms_key_id` (string) - The ID of the KMS key to use for boot volume encryption.
     This only applies to the main `region`, other regions where the AMI will be copied