Docs: review and update glab packages and glab container-registry documentation
## Summary Review and update the CLI documentation for the new `glab packages` and `glab container-registry` command groups once all related MRs are merged. ## Background The `glab packages` and `glab container-registry` command groups adds generic package registry support (`list`, `upload`, `download`, `delete`). This work item tracks that documentation review. ## Related issues and merge requests `glab packages` only: - Implementation work item: #7421 (Add Generic Package Repository access) - gitlab-org/cli!3393 — packages command group + `list` (merged) - gitlab-org/cli!3394 — `upload` - gitlab-org/cli!3395 — `download` - gitlab-org/cli!3396 — `delete` - gitlab-org/cli!2069 — securefile `get` (the command the packages group was modeled on; merged) ## Proposed tasks - [x] Review the generated command docs in `docs/source/` for the packages and container-registry commands - [x] Verify they follow the [glab documentation style guide](https://docs.gitlab.com/development/documentation/cli_styleguide/) - [x] Run `make gen-docs` and commit any updated files - [x] Fix any inaccuracies in command/flag descriptions or examples
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