markdown: Restore fallback language highlighting for untagged code blocks (#63023)
Restores fallback highlights lost in
https://github.com/zed-industries/zed/pull/28217
Release Notes:
- N/A
a7e23df67bKirill Bulatov committed on 8/21/2026, 4:00:50 PM· committed by GitHubparent51a3ac2