docs: Fix migrate from enzyme link in the sidebar (#601)

* Fix migrate from enzyme link in the sidebar * Update sidebars.json * change id to migrate-from-enzyme * change migrate to migrate-from-enzyme

Author: m98

docs/react-testing-library/migrate-from-enzyme.md

@@ -1,5 +1,5 @@
 ---
-id: migrate
+id: migrate-from-enzyme
 title: Migrate from Enzyme
 sidebar_label: Migrate from Enzyme
 ---