fix formatting

Author: nickdesaulniers

libc/test/src/stdbit/stdc_leading_zeros_ull_test.cpp

@@ -1,5 +1,4 @@
-//===-- Unittests for stdc_leading_zeros_ull
-//-------------------------------===//
+//===-- Unittests for stdc_leading_zeros_ull ------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.