Make slash commands more discoverable (#12480)

<img width="648" alt="image"
src="https://github.com/zed-industries/zed/assets/482957/a63df904-fbbe-4e0a-80b2-c98ebee90690">

Release Notes:

- N/A

Co-authored-by: Nathan <nathan@zed.dev>
a259042f92Antonio Scandurra committed on 5/30/2024, 2:45:05 PM· committed by GitHubparent436a8fa
16 files changedLine totals unavailable