Update adminforth/documentation/docs/tutorial/03-Customization/13-standardPagesTuning.md

Co-authored-by: Copilot <[email protected]>

Author: ivictbor

adminforth/documentation/docs/tutorial/03-Customization/13-standardPagesTuning.md

@@ -733,4 +733,4 @@ export default {
     ...
   ],
 ```
-This way, multiselect field displayed on filter page will be replaced with a default select field allowing only only value to be selected.
+This way, multiselect field displayed on filter page will be replaced with a default select field allowing only a single value to be selected.