fix typos

Co-authored-by: Oli Scherer <[email protected]>

Author: RalfJung

compiler/rustc_mir_transform/src/validate.rs

@@ -100,8 +100,8 @@ impl<'tcx> crate::MirPass<'tcx> for Validator {
 /// This checker covers basic properties of the control-flow graph, (dis)allowed statements and terminators.
 /// Everything checked here must be stable under substitution of generic parameters.
 ///
-/// Everything that depends on types, or otherwise can be affected by generic paramters,
-/// muts be checked in `TypeChecker`.
+/// Everything that depends on types, or otherwise can be affected by generic parameters,
+/// must be checked in `TypeChecker`.
 struct CfgChecker<'a, 'tcx> {
     when: &'a str,
     body: &'a Body<'tcx>,