Button docs cleanup (#54433)

Summary:
Pull Request resolved: #54433

Button links to js.coach, but this domain is up for sale. Let's clean it up

Changelog: [Internal]

Reviewed By: cipolleschi

Differential Revision: D86418236

fbshipit-source-id: 7be9782eb13b4fceb7d6439bea89ca7d277b6c69

Author: GijsWeterings

packages/react-native/Libraries/Components/Button.js

@@ -184,9 +184,6 @@ export type ButtonProps = $ReadOnly<{
   [button:source]:
   https://github.com/facebook/react-native/blob/HEAD/Libraries/Components/Button.js
 
-  [button:examples]:
-  https://js.coach/?menu%5Bcollections%5D=React%20Native&page=1&query=button
-
   ```jsx
   <Button
     onPress={onPressLearnMore}