Spellchecking compiler comments

This PR cleans up the rest of the spelling mistakes in the compiler comments. This PR does not change any literal or code spelling issues.

compiler/rustc_monomorphize/src/partitioning/default.rs

@@ -501,7 +501,7 @@ fn mono_item_visibility<'tcx>(
         // * First is weak lang items. These are basically mechanisms for
         //   libcore to forward-reference symbols defined later in crates like
         //   the standard library or `#[panic_handler]` definitions. The
-        //   definition of these weak lang items needs to be referenceable by
+        //   definition of these weak lang items needs to be referencable by
         //   libcore, so we're no longer a candidate for internalization.
         //   Removal of these functions can't be done by LLVM but rather must be
         //   done by the linker as it's a non-local decision.