correction to release notes with recent function app change

[martinbryant]

This PR closes #

The changes in this PR are as follows:

See here for the commit that included a release note for a fix. Must have been removed after @ninjarobot next PR was merged.

I have read the contributing guidelines and have completed the following:

• [ ] Tested my code end-to-end against a live Azure subscription.
• [ ] Updated the documentation in the docs folder for the affected changes.
• [ ] Written unit tests against the modified code that I have made.
• [x] Updated the release notes with a new entry for this PR.
• [ ] Checked the coding standards outlined in the contributions guide and ensured my code adheres to them.

If I haven't completed any of the tasks above, I include the reasons why here:

Below is a minimal example configuration that includes the new features, which can be used to deploy to Azure: