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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/numeric b/include/numeric
index 862396d..0fd48de 100644
--- a/include/numeric
+++ b/include/numeric
@@ -632,4 +632,4 @@
 #   include <__pstl_numeric>
 #endif
 
-#endif  // _LIBCPP_NUMERIC
+#endif // _LIBCPP_NUMERIC