Fixed typo (hashicorp#12351)

Author: nwalke

website/source/docs/providers/aws/r/iam_role.html.markdown

@@ -42,7 +42,7 @@ The following arguments are supported:
 * `name_prefix` - (Optional, Forces new resource) Creates a unique name beginning with the specified prefix. Conflicts with `name`.
 * `assume_role_policy` - (Required) The policy that grants an entity permission to assume the role.
 
-~> **NOTE:** This `assume_role_policy` is very similar but slightly different than just a standard IAM policy and cannot use an `aws_iam_policy` resource.  If _can_ however, use an `aws_iam_policy_document` [data source](https://www.terraform.io/docs/providers/aws/d/iam_policy_document.html), see example below for how this could work.
+~> **NOTE:** This `assume_role_policy` is very similar but slightly different than just a standard IAM policy and cannot use an `aws_iam_policy` resource.  It _can_ however, use an `aws_iam_policy_document` [data source](https://www.terraform.io/docs/providers/aws/d/iam_policy_document.html), see example below for how this could work.
 
 * `path` - (Optional) The path to the role.
   See [IAM Identifiers](https://docs.aws.amazon.com/IAM/latest/UserGuide/Using_Identifiers.html) for more information.