Addressed comments by @compiler-errors and @bjorn3

compiler/rustc_mir_build/src/build/matches/mod.rs

@@ -444,7 +444,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             // we lower the guard.
             let target_block = self.cfg.start_new_block();
             let mut schedule_drops = true;
-            // We keep a stack of all of the bindings and type descriptions
+            // We keep a stack of all of the bindings and type ascriptions
             // from the parent candidates that we visit, that also need to
             // be bound for each candidate.
             traverse_candidate(

compiler/rustc_mir_build/src/build/matches/test.rs

@@ -234,7 +234,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     };
                     TerminatorKind::if_(self.tcx, Operand::Copy(place), true_bb, false_bb)
                 } else {
-                    // The switch may be inexhaustible so we have a catch all block
+                    // The switch may be inexhaustive so we have a catch all block
                     debug_assert_eq!(options.len() + 1, target_blocks.len());
                     let otherwise_block = *target_blocks.last().unwrap();
                     let switch_targets = SwitchTargets::new(

compiler/rustc_mir_build/src/thir/pattern/deconstruct_pat.rs

@@ -1650,7 +1650,7 @@ impl<'p, 'tcx> fmt::Debug for DeconstructedPat<'p, 'tcx> {
                     }
 
                     // Without `cx`, we can't know which field corresponds to which, so we can't
-                    // get the names of the fields. Instead we just display everything as a simple
+                    // get the names of the fields. Instead we just display everything as a tuple
                     // struct, which should be good enough.
                     write!(f, "(")?;
                     for p in self.iter_fields() {