docs: Add missing option for `show_whitespaces` setting (#45667)
The value for the `trailing` option in the `show_whitespaces` setting
was not documented, so I have added it.
Related Issue:
https://github.com/zed-industries/zed/pull/32329#issuecomment-3581576128
Release Notes:
- N/A
665ee3e6a7Koutaro Miura committed on 1/2/2026, 6:12:49 AM· committed by GitHubparent8e82503