remove broken link

src/librustc_infer/infer/region_constraints/mod.rs

@@ -784,7 +784,7 @@ impl<'tcx> RegionConstraintCollector<'_, 'tcx> {
         )
     }
 
-    /// See [`RegionInference::region_constraints_added_in_snapshot`].
+    /// See `InferCtxt::region_constraints_added_in_snapshot`.
     pub fn region_constraints_added_in_snapshot(&self, mark: &Snapshot<'tcx>) -> Option<bool> {
         self.undo_log
             .region_constraints_in_snapshot(mark)