Fix nodejs-cli link at end of backend setup page

Author: cbush

source/tutorial/realm-app.txt

@@ -502,4 +502,4 @@ mobile or web application.
 - :doc:`Android (Kotlin) </tutorial/android-kotlin>`
 - :doc:`React Native (JavaScript) </tutorial/react-native>`
 - :doc:`Web/GraphQL (TypeScript) </tutorial/web-graphql>`
-- :doc:`Node </tutorial/node>`
+- :doc:`Node </tutorial/nodejs-cli>`