docs: add carapace completions note

Jonathan Bowerequested to merge
gitlab-community/gitlab-org/cli:carapace-completion-note into main

Description

Adding a note to `docs/installation_options.md` recommending carapace-bin for completion if using an unsupported shell.

  • feat: Update Completion Help with Carapace Note

Related Issues

Related to #8167

How has this been tested?

No testing required for the documentation change, but I have used the carapace-bin completions for glab without issue.

Screenshots (if appropriate):

Edited by Jonathan Bowe

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