Fixed/added namespace ending comments using clang-tidy. NFC

The patch is generated using this command:

tools/clang/tools/extra/clang-tidy/tool/run-clang-tidy.py -fix \
  -checks=-*,llvm-namespace-comment -header-filter='llvm/.*|clang/.*' \
  llvm/lib/


Thanks to Eugene Kosov for the original patch!

llvm-svn: 240137
diff --git a/llvm/lib/MC/WinCOFFObjectWriter.cpp b/llvm/lib/MC/WinCOFFObjectWriter.cpp
index 56ef1c7..5bc1404 100644
--- a/llvm/lib/MC/WinCOFFObjectWriter.cpp
+++ b/llvm/lib/MC/WinCOFFObjectWriter.cpp
@@ -191,7 +191,7 @@
 
   void writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
 };
-}
+} // namespace
 
 static inline void write_uint32_le(void *Data, uint32_t Value) {
   support::endian::write<uint32_t, support::little, support::unaligned>(Data,