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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/variant b/include/variant
index 43b6aa7..2d4bb74 100644
--- a/include/variant
+++ b/include/variant
@@ -1765,10 +1765,10 @@
   }
 };
 
-#endif  // _LIBCPP_STD_VER > 14
+#endif // _LIBCPP_STD_VER > 14
 
 _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
 
-#endif  // _LIBCPP_VARIANT
+#endif // _LIBCPP_VARIANT