Merge branch 'docs-update-readme-source-links' into 'master'

Update canonical source repo links in README.md

See merge request gitlab-org/gitlab!17214

README.md

@@ -2,9 +2,9 @@
 
 ## Canonical source
 
-The canonical source of GitLab Community Edition is [hosted on GitLab.com](https://gitlab.com/gitlab-org/gitlab-ce/).
+The canonical source of GitLab where development takes place is [hosted on GitLab.com](https://gitlab.com/gitlab-org/gitlab).
 
-The source of GitLab Enterprise Edition is [hosted on GitLab.com](https://gitlab.com/gitlab-org/gitlab-ee).
+A FOSS source of GitLab is hosted on a [mirrored, read-only project on GitLab.com](https://gitlab.com/gitlab-org/gitlab-foss/).
 
 ## Free trial