docs: Improve custom keybinding for external agent example (#42776)
Follow up to https://github.com/zed-industries/zed/pull/42772 adding
some comments to improve clarity.
Release Notes:
- N/A
1277f328c4Danilo Leal committed on 11/14/2025, 11:08:46 PM· committed by GitHubparentb3097cf