docs: Add missing `ui_font_size` option in `configuring-zed.md` (#18189)

Added `ui_font_size`, an option that works in the editor but is missing
from the documentation.

Release Notes:

- N/A

Junseong Park committed 1y ago

0f4ebdfbca721614f3cadafc3b44e4fbf099afda

Parent: 37c93d8

Committed by GitHub <noreply@github.com> on 9/22/2024, 9:15:13 AM