Fixed missing single quote in Admin Configuration.md

Not much to say, just another hypotetical typo I stumbled upon while using the docs

Author: ImJstNickDev

docs/pages/developing-extensions/Admin-configuration.md

@@ -134,7 +134,7 @@ class {identifier}SettingsFormRequest extends AdminFormRequest
         return [
             'theme' => 'Theme',
             'customName' => 'Custom Name',
-            'count' => 'Count,
+            'count' => 'Count',
         ];
     }
 }
@@ -254,4 +254,4 @@ And now you're done. You should be able to load and save your admin configuratio
 <div class="btn-group docs-navigator" role="group" aria-label="Navigation" style="float: right">
   <a href="?page=developing-extensions/Custom-controllers" class="btn btn-dark bg-light-subtle border-0 rounded-start-pill">Previous</a>
   <a href="?page=developing-extensions/Custom-table-and-migrations" class="btn btn-dark bg-light-subtle border-0 rounded-end-pill">Next</a>
-</div>
+</div>