docs(website): add missing "the"

Refs: https://gallaudet.edu/student-success/tutorial-center/english-center/grammar-and-vocabulary/definite-and-indefinite-articles/a-an-the-general-or-specific/

Author: TurekBot

src/docs/handbook/web-testing/page-element-query-language.md

@@ -797,7 +797,7 @@ await actorCalled('Alice').attemptsTo(
 ```
 
 You can also define a chain of filtering calls to **resolve it dynamically**
-in the context of a root element at runtime, improving reusability of your code:
+in the context of a root element at runtime, improving the reusability of your code:
 
 ```typescript
 import { actorCalled } from '@serenity-js/core'