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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/condition_variable b/include/condition_variable
index 8c73344..a33250c 100644
--- a/include/condition_variable
+++ b/include/condition_variable
@@ -265,4 +265,4 @@
 
 #endif // !_LIBCPP_HAS_NO_THREADS
 
-#endif  // _LIBCPP_CONDITION_VARIABLE
+#endif // _LIBCPP_CONDITION_VARIABLE