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

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/include/memory b/include/memory
index 35c0a29..74a430d 100644
--- a/include/memory
+++ b/include/memory
@@ -961,4 +961,4 @@
 #   include <__pstl_memory>
 #endif
 
-#endif  // _LIBCPP_MEMORY
+#endif // _LIBCPP_MEMORY