Fix developer links and newly discovered spelling errors (#75875)

* Fix developer links

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Fix newly discovered spelling errors

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

---------

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

docs/sources/developers/angular_deprecation/_index.md

@@ -40,7 +40,7 @@ We encourage you to locate the repository of the corresponding plugin and create
 
 ### Links
 
-- [Migrate Angular to React]({{< relref "../plugins/migration-guide/angular-react/" >}})
+- [Migrate Angular to React](https://grafana.com/developers/plugin-tools/migration-guides/migrate-angularjs-to-react)
 - [Build a panel plugin](https://grafana.com/tutorials/build-a-panel-plugin/)
 - [Build a data source plugin](https://grafana.com/tutorials/build-a-data-source-plugin/)
 - [List of current Angular plugins]({{< relref "./angular-plugins/" >}})