assistant: Make including warnings for the diagnostic command more discoverable (#13323)

This makes the `--include-warnings` argument more discoverable

<img width="651" alt="image"
src="https://github.com/zed-industries/zed/assets/53836821/02d32496-ad7a-4670-85ce-eda945c0f1c2">

Release Notes:

- N/A
5a6c55149aBennet Bo Fenner committed on 6/20/2024, 5:48:13 PM· committed by GitHubparentd5b0df6
3 files changedLine totals unavailable