fix: clarifying upgrade needed notice in admin (#789)

source/php/Upgrade.php

@@ -26,7 +26,7 @@ public function addAdminNotice()
         if (empty($currentDbVersion) || $currentDbVersion < $this->dbVersion) {
             echo sprintf(
                 '<div class="notice notice-warning update-nag inline">%s</div>',
-                __('A newer version of Modularity is available. Run wp-cli "modularity upgrade" to upgrade.', 'modularity')
+                __('The database may need to be updated to accomodate new datatastructures. Run wp-cli "modularity upgrade" to upgrade.', 'modularity')
             );
 
         }