feat(docs): include documentation on how to build docs locally

docs/contribute/submitting_changes.md

@@ -85,9 +85,14 @@ The action is an automated service provided by GitHub that ensures suggested add
 
 Our GitHub action is triggered on pushes to the `data-infra` repository related to the `docs` directory.
 
+Another way to edit and test your markdown changes is using the jupyterhub.  Edit the text files directly then run this command from the base of the data-infra repo: `jb build docs --warningiserror`.
+
+This will locally build the docs and allow you to test your changes without having to make lots of commits.
+
 (docs-preview)=
 
 ## How do I preview my docs change?
 
 Once the GitHub action has run and all tests have passed a 'Netlify' preview link will be generated. You can find this link in the comments of your PR. Follow that link to preview your changes.
 ![Collection Matrix](assets/netlify-link.png)
+