Add example of git cherry-pick for backporting bug fixes
The cherry-pick section mentions backporting bug fixes but doesn't show a concrete example.
**Location** https://docs.gitlab.com/ee/topics/git/advanced.html
**Current Text** "Use it to: Backport bug fixes from the default branch to previous release branches."
**Suggested Fix** Add an example: "For example, if you fixed a bug on your `main` branch with commit abc123, you can apply just that fix to your `release-v1` branch with: `git checkout release-v1` then `git cherry-pick abc123`"
**Why This Helps** Gives users a practical example they can follow.
## ~"quick win" ~documentation ~Documentation ~"type::documentation"
issue