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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/__nullptr b/include/__nullptr
index 45529a7..e147511 100644
--- a/include/__nullptr
+++ b/include/__nullptr
@@ -56,6 +56,6 @@
     typedef decltype(nullptr) nullptr_t;
 }
 
-#endif  // _LIBCPP_HAS_NO_NULLPTR
+#endif // _LIBCPP_HAS_NO_NULLPTR
 
-#endif  // _LIBCPP_NULLPTR
+#endif // _LIBCPP_NULLPTR