[TypeChecker] Fixing typos from previous patch

Author: LucianoPAlmeida

lib/Sema/TypeCheckConstraints.cpp

@@ -3357,7 +3357,7 @@ CheckedCastKind TypeChecker::typeCheckCheckedCast(Type fromType,
         const auto &fromElt = fromTuple->getElement(i);
         const auto &toElt = toTuple->getElement(i);
 
-        // We should only perform name validation if both element have a label,
+        // We should only perform name validation if both elements have a label,
         // because unlabeled tuple elements can be converted to labeled ones
         // e.g.
         // 

lib/Sema/TypeCheckProtocol.cpp

@@ -4548,7 +4548,7 @@ TypeChecker::couldDynamicallyConformToProtocol(Type type, ProtocolDecl *Proto,
 
   ModuleDecl *M = DC->getParentModule();
   // For standard library collection types such as Array, Set or Dictionary
-  // which have custom casting machinery implemented in situations like:
+  // which have custom casting machinery implemented for situations like:
   //
   //  func encodable(_ value: Encodable) {
   //    _ = value as! [String : Encodable]