Rollup merge of #83980 - pierwill:fix-compiler-librustc-names, r=davidtwco

Fix outdated crate names in compiler docs

Changes `librustc_X` to `rustc_X`, only in documentation comments.
Plain code comments are left unchanged.

compiler/rustc_mir/src/borrow_check/region_infer/graphviz.rs

@@ -1,5 +1,5 @@
 //! This module provides linkage between RegionInferenceContext and
-//! librustc_graphviz traits, specialized to attaching borrowck analysis
+//! `rustc_graphviz` traits, specialized to attaching borrowck analysis
 //! data to rendered labels.
 
 use std::borrow::Cow;