Docs: Update documentation to reflect protected tags behavior
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=577248) </details> <!--IssueSummary end--> - [x] Start this issue's title with `Docs:` or `Docs feedback:`. ## Problem to solve This issue is to document the tag improvements in the following docs pages: - [Protected tags](https://docs.gitlab.com/user/project/protected_tags/) - [Protected tags API](https://docs.gitlab.com/api/protected_tags/) ## Other links/references - Epic: https://gitlab.com/groups/gitlab-org/-/work_items/19673+
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