[mv3] Add link to documentation

Author: gorhill

platform/mv3/extension/_locales/en/messages.json

@@ -35,6 +35,10 @@
     "message": "Privacy policy",
     "description": "Link to privacy policy on GitHub (English)"
   },
+  "aboutDocumentation": {
+    "message": "Documentation",
+    "description": "Link to documentation in About pane"
+  },
   "popupFilteringModeLabel": {
     "message": "filtering mode",
     "description": "Label in the popup panel for the current filtering mode"

platform/mv3/extension/dashboard.html

@@ -171,6 +171,7 @@ <h3 data-i18n="sandboxEditorLabel">_</h3>
             <div class="li">Copyright (c) Raymond Hill 2014-present</div>
         </div>
         <div class="li"><a href="https://github.com/uBlockOrigin/uBOL-home/wiki/Privacy-policy" data-i18n="aboutPrivacyPolicy"></a></div>
+        <div class="li"><a href="https://github.com/uBlockOrigin/uBOL-home/wiki" data-i18n="aboutDocumentation"></a></div>
         <div class="li"><a href="https://github.com/uBlockOrigin/uBOL-home/releases" data-i18n="aboutChangelog"></a></div>
         <div class="li"><a href="https://github.com/gorhill/uBlock" data-i18n="aboutCode"></a></div>
         <div class="li"><span data-i18n="aboutContributors"></span></div>