Add documentation on advanced settings->reverb preset

[dingodoppelt]

Short description of changes
Documents Advanced Settings -> Reverb Preset

Context: Fixes an issue? Related issues
jamulussoftware/jamulus#3787

Status of this Pull Request

What is missing until this pull request can be merged?

Does this need translation?
Yes

Checklist

• I've verified that this Pull Request follows the general code principles
• I waited some time after this Pull
  Request was opened and all GitHub checks completed without errors.
• I'm sure that this Pull Request goes to the correct branch

[pljones]

That ...jamulus.io would need re-screenshot-ing to ...jamulus.app.

[pljones]

Can you try rebasing to a refetched upstream, please.

[dingodoppelt]

Can you try rebasing to a refetched upstream, please.

This is already rebased on next-release. I guess only another commit would trigger the fixed workflow?

[pljones]

OK, so the automagick upmerge from release to next-release didn't work for Jekyll... I don't have time to check it today, unfortunately.

[pljones]

Right, I think rebasing now should work. It should be based off commit dd096f2 (if I read it right).

git checkout next-release
git pull upstream next-release
git push
git checkout -
git rebase -i next-release ;# and check it's just your branch commit(s)