chore: Fixed example link in README.md (#300)

Author: krastin

README.md

@@ -140,7 +140,7 @@ module "vote_service_sg" {
 ## Examples
 
 * [Complete Security Group example](https://github.com/terraform-aws-modules/terraform-aws-security-group/tree/master/examples/complete) shows all available parameters to configure security group.
-* [Security Group "Rules Only" example](https://github.com/terraform-aws-modules/terraform-aws-security-group/tree/master/examples/complete) shows how to manage just rules of a security group that is created outside.
+* [Security Group "Rules Only" example](https://github.com/terraform-aws-modules/terraform-aws-security-group/tree/master/examples/rules-only) shows how to manage just rules of a security group that is created outside.
 * [HTTP Security Group example](https://github.com/terraform-aws-modules/terraform-aws-security-group/tree/master/examples/http) shows more applicable security groups for common web-servers.
 * [Disable creation of Security Group example](https://github.com/terraform-aws-modules/terraform-aws-security-group/tree/master/examples/disabled) shows how to disable creation of security group.
 * [Dynamic values inside Security Group rules example](https://github.com/terraform-aws-modules/terraform-aws-security-group/tree/master/examples/dynamic) shows how to specify values inside security group rules (data-sources and variables are allowed).