r/aws_iam_role: improve inline_policy deprecation message

[jar-b]

Description

The updated deprecation message now includes the impacted argument name, providing clarity around what argument should be addressed.

│ Warning: Argument is deprecated
│
│   with aws_iam_role.test,
│   on main.tf line 33, in resource "aws_iam_role" "test":
│   33: resource "aws_iam_role" "test" {
│
│ The inline_policy argument is deprecated. Use the aws_iam_role_policy resource instead. If Terraform should exclusively manage all inline policy associations (the current behavior
│ of this argument), use the aws_iam_role_policies_exclusive resource as well.

Also updates the registry documentation to include deprecation warnings above the inline_policy examples.

Relations

Relates #39203
Relates #22336

[github-actions]

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[ewbankkit]

LGTM 🚀.