docs: correct ts check script name in CONTRIBUTING file (#11785)

**Motivation**

This pull request updates the contributing file to correct a command
inconsistency. The previous command `yarn typescript` has been replaced
with the accurate `yarn typecheck`. This change ensures alignment with
the correct command for TypeScript type-checking.

CONTRIBUTING.md

@@ -29,7 +29,7 @@ yarn example start
 Make sure your code passes TypeScript and ESLint. Run the following to verify:
 
 ```sh
-yarn typescript
+yarn typecheck
 yarn lint
 ```