README.md Markdown link typo fix

This commit fixes a Markdown link typo and includes link checking for references.

README.md

@@ -207,8 +207,10 @@ Copyright © 2020 [Mineiros GmbH][homepage]
 [badge-terraform]: https://img.shields.io/badge/terraform-0.13%20and%200.12.20+-623CE4.svg?logo=terraform
 [badge-slack]: https://img.shields.io/badge/[email protected]?logo=slack
 
+<!-- markdown-link-check-disable -->
 [build-status]: https://mineiros.semaphoreci.com/projects/terraform-github-team
 [releases-github]: https://github.com/mineiros-io/terraform-github-team/releases
+<!-- markdown-link-check-enable -->
 
 [releases-terraform]: https://github.com/hashicorp/terraform/releases
 [apache20]: https://opensource.org/licenses/Apache-2.0
@@ -217,12 +219,14 @@ Copyright &copy; 2020 [Mineiros GmbH][homepage]
 [AWS]: https://aws.amazon.com/
 [Semantic Versioning (SemVer)]: https://semver.org/
 
-[Github teams](https://help.github.com/en/github/setting-up-and-managing-organizations-and-teams/organizing-members-into-teams)
+[Github teams]: (https://help.github.com/en/github/setting-up-and-managing-organizations-and-teams/organizing-members-into-teams)
 
+<!-- markdown-link-check-disable -->
 [variables.tf]: https://github.com/mineiros-io/terraform-github-team/blob/master/variables.tf
 [examples/]: https://github.com/mineiros-io/terraform-github-team/tree/master/examples
 [Issues]: https://github.com/mineiros-io/terraform-github-team/issues
 [LICENSE]: https://github.com/mineiros-io/terraform-github-team/blob/master/LICENSE
 [Makefile]: https://github.com/mineiros-io/terraform-github-team/blob/master/Makefile
 [Pull Requests]: https://github.com/mineiros-io/terraform-github-team/pulls
 [Contribution Guidelines]: https://github.com/mineiros-io/terraform-github-team/blob/master/CONTRIBUTING.md
+<!-- markdown-link-check-enable -->