docs: fix migration-guide route

Author: rakannimer

src/docs/documentation/references/migration-guide.mdx

@@ -1,3 +1,10 @@
+---
+name: Migration Guide
+route: /docs/migration-guide
+parent: Documentation
+menu: References
+---
+
 # Migration Guide
 
 The [v2 release](https://github.com/pedronauck/docz/pull/950) is our biggest release in terms of changes to our core scripts. Our bundler system was entirely modified in order to use Gatsby as default bundler and you will need to update your code if you’re coming from a previous version. 
@@ -126,4 +133,4 @@ module.exports = {
 
 ## Examples 
 
-Make sure to check out [docz's `examples` directory](https://github.com/doczjs/docz/tree/master/examples) for the full list of supported examples.
+Make sure to check out [docz's `examples` directory](https://github.com/doczjs/docz/tree/master/examples) for the full list of supported examples.