Updating documentation to include details for the skip_region_validation configuration option

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

@@ -146,6 +146,9 @@ builder.
 -   `root_volume_size` (integer) - The size of the root volume for the chroot
     environment, and the resulting AMI
 
+-   `skip_region_validation` (boolean) - Set to true if you want to skip 
+    validation of the ami_regions configuration option.  Defaults to false.
+
 -   `tags` (object of key/value strings) - Tags applied to the AMI.
 
 ## Basic Example

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

@@ -166,6 +166,9 @@ builder.
     described above. Note that if this is specified, you must omit the
     `security_group_id`.
 
+-   `skip_region_validation` (boolean) - Set to true if you want to skip 
+    validation of the region configuration option.  Defaults to false.
+
 -   `spot_price` (string) - The maximum hourly price to pay for a spot instance
     to create the AMI. Spot instances are a type of instance that EC2 starts
     when the current spot price is less than the maximum price you specify. Spot

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

@@ -191,6 +191,9 @@ builder.
     described above. Note that if this is specified, you must omit the
     `security_group_id`.
 
+-   `skip_region_validation` (boolean) - Set to true if you want to skip 
+    validation of the region configuration option.  Defaults to false.
+
 -   `spot_price` (string) - The maximum hourly price to launch a spot instance
     to create the AMI. It is a type of instances that EC2 starts when the
     maximum price that you specify exceeds the current spot price. Spot price