port over addition of mfs_code to various amazon docs on website

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

@@ -195,6 +195,9 @@ builder.
   preserved when booting from the AMI built with Packer. See
   `ami_block_device_mappings`, above, for details.
 
+- `mfa_code` (string) - The MFA [TOTP](https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm)
+  code. This should probably be a user variable since it changes all the time.
+
 - `region_kms_key_ids` (map of strings) - a map of regions to copy the ami to, 
   along with the custom kms key id to use for encryption for that region. 
   Keys must match the regions provided in `ami_regions`. If you just want to 

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

@@ -188,6 +188,9 @@ builder.
     preserved when booting from the AMI built with packer. See
     `ami_block_device_mappings`, above, for details.
 
+- `mfa_code` (string) - The MFA [TOTP](https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm)
+   code. This should probably be a user variable since it changes all the time.
+
 - `region_kms_key_ids` (map of strings) - a map of regions to copy the ami to, 
    along with the custom kms key id to use for encryption for that region. 
    Keys must match the regions provided in `ami_regions`. If you just want to 

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

@@ -115,6 +115,9 @@ builder.
     profile](https://docs.aws.amazon.com/IAM/latest/UserGuide/instance-profiles.html)
     to launch the EC2 instance with.
 
+- `mfa_code` (string) - The MFA [TOTP](https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm)
+   code. This should probably be a user variable since it changes all the time.
+
 - `region_kms_key_ids` (map of strings) - a map of regions to copy the ami to, 
    along with the custom kms key id to use for encryption for that region. 
    Keys must match the regions provided in `ami_regions`. If you just want to 

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

@@ -211,6 +211,9 @@ builder.
     preserved when booting from the AMI built with Packer. See
     `ami_block_device_mappings`, above, for details.
 
+- `mfa_code` (string) - The MFA [TOTP](https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm)
+   code. This should probably be a user variable since it changes all the time.
+
 - `region_kms_key_ids` (map of strings) - a map of regions to copy the ami to, 
    along with the custom kms key id to use for encryption for that region. 
    Keys must match the regions provided in `ami_regions`. If you just want to