chore: cleanup unused Tabs and TabItem imports

Author: nickserv

docs/dom-testing-library/api-custom-queries.mdx

@@ -3,9 +3,6 @@ id: api-custom-queries
 title: Custom Queries
 ---
 
-import Tabs from '@theme/Tabs'
-import TabItem from '@theme/TabItem'
-
 `DOM Testing Library` exposes many of the helper functions that are used to
 implement the default queries. You can use the helpers to build custom queries.
 For example, the code below shows a way to override the default `testId` queries