GitLab CLI: Release Command Help Formatting

Updated help examples for release commands to match the project's CLI style guide for consistent formatting.

I updated the help examples for GitLab CLI release commands to match the project’s doc style ($ for commands, > for output, # for comments).

This was a small docs cleanup, but it makes the help text easier to scan and keeps it consistent across the CLI.

I updated the create, delete, download, upload and view commands under commands/release/, and regenerated their pages in docs/source/release/.

Merged quickly after maintainer review.

Links: MR !2064 • Issue #7840