Fix misleading comment. NFC

llvm-svn: 238938
diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index 25fe063..2ecaf66 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -726,7 +726,7 @@
 };
 }
 
-} // end namespace toolchains
+} // end namespace tools
 } // end namespace driver
 } // end namespace clang