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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/csignal b/include/csignal
index 99abd02..4cb0707 100644
--- a/include/csignal
+++ b/include/csignal
@@ -54,4 +54,4 @@
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif  // _LIBCPP_CSIGNAL
+#endif // _LIBCPP_CSIGNAL