Fix code example ion req.query (#1366)

closes #1361
closes #1366

_includes/api/en/5x/req-query.md

@@ -11,7 +11,7 @@ The value of this property can be configured with the [query parser application
 
 ```js
 const qs = require('qs')
-app.setting('query parser',
+app.set('query parser',
   (str) => qs.parse(str, { /* custom options */ }))
 ```