docs(ssh-key): add synopsis and examples to ssh-key commands
Description
Adds Long (Synopsis) fields and improved Examples to the ssh-key
command and its subcommands, as part of the style guide audit identified
in #8263 (closed).
Each Synopsis explains the command's default behavior and key flags, without
repeating the Short description. The list Examples section is annotated
with # comment lines describing each invocation.
Commands updated:
ssh-keyssh-key deletessh-key getssh-key list
Content follows the documentation style guide and the GitLab CLI (glab) documentation style guide.
Related issues and merge requests
Documentation
If this MR adds or updates CLI command documentation, follow the conventions in the
GitLab CLI (glab) documentation style guide,
run make gen-docs, and commit the updated files in docs/source/.