Update 'Upgade' section

Author: petefoth

index.html

@@ -180,9 +180,7 @@ <h4>Dirty install (keep data and installed apps)</h4>
       </section>
       <section>
         <h3>Upgrade</h3>
-        <p>To upgrade from one LineageOS for microG major version
-        (15.1, 16.0, 17.1 or 18.1) to another, follow the instrucions
-        for your device <a href="https://wiki.lineageos.org/upgrade_guides.html">here</a>.</p>
+        <p>To upgrade from one LineageOS for microG major version to a higher version (e.g. 21.0 -&gt; 22.1) see <a href="https://github.com/lineageos4microg/l4m-wiki/wiki/Installation#ugrade-to-a-higher-android--lineageos-version">this section in the wiki</a>.</p>
       </section>
       <header class="major">
         <h2>Post-install</h2>