Document Go hard tabs in default settings (#41459)

Closes https://github.com/zed-industries/zed/issues/40876

This is already present in the code but missing from the default
settings, which is confusing.

Release Notes:

- N/A
01a1b9b2c1Justin Su committed on 10/29/2025, 1:44:26 PM· committed by GitHubparentd44437d
1 file changedLine totals unavailable