docs(website): fix e.g. use

I also switched out "which" for "whose", because that's more correct.

Author: TurekBot

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

@@ -820,8 +820,8 @@ await actorCalled('Alice').attemptsTo(
 
 ### Finding a sibling element
 
-To find a sibling element, e.g. find a destroy button for an item which label contains a certain text:
-- find the container element which descendant element meets your conditions,
+To find a sibling element, e.g. to find a destroy button for an item whose label contains a certain text:
+- find the container element whose descendant element meets your conditions,
 - locate the sibling element within that container element.
 
 ```typescript