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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/limits.h b/include/limits.h
index 4a212f8..938f887 100644
--- a/include/limits.h
+++ b/include/limits.h
@@ -61,4 +61,4 @@
 #include_next <limits.h>
 #endif // __GNUC__
 
-#endif  // _LIBCPP_LIMITS_H
+#endif // _LIBCPP_LIMITS_H