Update README.md (#30856)

fix typo for the Docker README

docker/README.md

@@ -1,7 +1,7 @@
 # Gitea - Docker
 
-Dockerfile is found in root of repository.
+Dockerfile is found in the root of the repository.
 
-Docker image can be found on [docker hub](https://hub.docker.com/r/gitea/gitea)
+Docker image can be found on [docker hub](https://hub.docker.com/r/gitea/gitea).
 
-Documentation on using docker image can be found on [Gitea Docs site](https://docs.gitea.com/installation/install-with-docker-rootless)
+Documentation on using docker image can be found on [Gitea Docs site](https://docs.gitea.com/installation/install-with-docker-rootless).