Fix broken url in doc
Fix broken url in doc

Fixes the url at line 54 in [/docs/providers/aws/r/wafregional_rate_based_rule.html](/docs/providers/aws/r/wafregional_rate_based_rule.html)
kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,kjmkznr/terraform-provider-aws,Ninir/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws