[libc++] NFC: Normalize `#endif //` comment indentation

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/stdio.h b/include/stdio.h
index e08e6bc..f841220 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -116,4 +116,4 @@
 
 #endif
 
-#endif  // _LIBCPP_STDIO_H
+#endif // _LIBCPP_STDIO_H