Merge pull request #2874 from practicalswift/top-of-file-headers

[gardening] Fix formatting of two recently introduced file headers.

Author: practicalswift

include/swift/Runtime/MutexWin32.h

@@ -1,4 +1,4 @@
-//===--- MutexWin32.h - ---------------------------------------------------===//
+//===--- MutexWin32.h - -----------------------------------------*- C++ -*-===//
 //
 // This source file is part of the Swift.org open source project
 //
@@ -92,4 +92,4 @@ struct ReadWriteLockPlatformHelper {
 };
 }
 
-#endif
+#endif

stdlib/public/runtime/ErrorObjectNative.cpp

@@ -1,4 +1,4 @@
-//===--- ErrorObject.cpp - Recoverable error object -----------------------===//
+//===--- ErrorObjectNative.cpp - Recoverable error object -----------------===//
 //
 // This source file is part of the Swift.org open source project
 //