Fix link

Author: richmolj

_site/quickstart.html

@@ -341,7 +341,7 @@ <h2>
   </li>
   <li>
     <p>Different errors can be customized with different response codes,
-  JSON, and side-effects. See more in the <a href="https://www.graphiti.dev/guides/error-handling">Error Handling
+  JSON, and side-effects. See more in the <a href="https://www.graphiti.dev/guides/concepts/error-handling">Error Handling
   Guide</a>.</p>
   </li>
 </ul>

quickstart.md

@@ -188,7 +188,7 @@ end
 
   * Different errors can be customized with different response codes,
   JSON, and side-effects. See more in the [Error Handling
-  Guide]({{site.github.url}}/guides/error-handling).
+  Guide]({{site.github.url}}/guides/concepts/error-handling).
 
 {% include h.html tag="h2" text="Persisting" a="persisting" %}