Fix anchor link to #render under cleanUp (testing-library#717)

Author: lwkchan

docs/vue-testing-library/api.mdx

@@ -223,7 +223,7 @@ See a working example of `update` in the
 
 ## `cleanup`
 
-Unmounts Vue trees that were mounted with [render](#render).
+Unmounts Vue trees that were mounted with [render](#rendercomponent-options-callback).
 
 > If you are using an environment that supports `afterEach` hook (as in Jest),
 > there's no need to call `cleanup` manually. Vue Testing Library handles it for