chore(README.md): trademark link

Author: johaven

README.md

@@ -102,7 +102,7 @@ Before submitting your pull request, please confirm the following:
 This project is licensed under the **GNU Affero General Public License (AGPL-3.0-or-later)**.  
 See [LICENSE](LICENSE) for the full text.
 
-Sync-in® is a registered trademark, see our [Trademark Policy](https://sync-in.com/docs/about/trademark).
+Sync-in® is a registered trademark, see our [Trademark Policy](https://sync-in.com/trademark).
 
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