docs: Fix link/reference in CSS language doc (#39952)

Looking at
https://github.com/zed-industries/zed/blob/5698636c92d015738843ad1ce982b887a236110a/crates/languages/src/css.rs#L19
it appears that the vscode-css-languageservice is used so I think this
was a typo.

Release Notes:

- N/A
89bb2de450Ned Zimmerman committed on 10/11/2025, 7:38:13 AM· committed by GitHubparent3d4d8ef
1 file changedLine totals unavailable