Fix typo in banner

docs/docusaurus.config.js

@@ -13,7 +13,7 @@ module.exports = {
     announcementBar: {
         id: 'customisation_block',
         content:
-          'As of 10th of April of 2024, installating custom modules in **new** websites is not supported.' +
+          'As of 10th of April of 2024, installing custom modules in **new** websites is not supported.' +
           'Any documentation in reference to it is kept for existing instances.',
         backgroundColor: '#f3a07a',
         textColor: '#fff',