fix: about link in webdriverio

Author: MatanBobi

docs/webdriverio-testing-library/intro.mdx

@@ -24,7 +24,7 @@ npm install --save-dev @testing-library/webdriverio
 ### `setupBrowser`
 
 Accepts a WebdriverIO [browser object](https://webdriver.io/docs/browserobject)
-and returns dom-testing-library [queries](/docs/queries/about) modifed to return
+and returns dom-testing-library [queries](/docs/queries/about.mdx) modifed to return
 WebdriverIO elements like normal
 [selectors](https://webdriver.io/docs/selectors/). **All queries are async** and
 are bound to `document.body` by default.