Add punctuation

Author: sdras

README.md

@@ -445,7 +445,7 @@ Set up your GitHub Actions workflow with a specific version of your programming
 - [Build And Push Your Docker Images Caching Each Stage To Reduce Build Time](https://github.com/whoan/docker-build-with-cache-action)
 - [Set up Docker Buildx](https://github.com/crazy-max/ghaction-docker-buildx)
 - [Convert Branch or Tag Name Into Docker-Compatible Image Tag](https://github.com/ankitvgupta/ref-to-tag-action/)
-- [Update a Container Repository Description From README.md](https://github.com/marketplace/actions/update-container-description-action) (Supported Registries: Docker Hub, Quay, Harbor)
+- [Update a Container Repository Description From README.md](https://github.com/marketplace/actions/update-container-description-action) - Supported Registries: Docker Hub, Quay, Harbor.
 
 #### Kubernetes