Update README.md and docs (#51)

Co-authored-by: max-lobur <[email protected]>

README.md

@@ -88,10 +88,6 @@ We highly recommend that in your code you pin the version to the exact version y
 using so that your infrastructure remains stable, and update versions in a
 systematic way so that they do not catch you by surprise.
 
-Also, because of a bug in the Terraform registry ([hashicorp/terraform#21417](https://github.com/hashicorp/terraform/issues/21417)),
-the registry shows many of our inputs as required when in fact they are optional.
-The table below correctly indicates which inputs are required.
-
 
 This module is primarily for setting security group rules on a security group. You can provide the
 ID of an existing security group to modify, or, by default, this module will create a new security