Troubleshoot: Remove persistent utilties with wildcard.fixpersistentutilities

[tkimnguyen]

We need to document fully how to use https://pypi.org/project/wildcard.fixpersistentutilities/ on the https://5.docs.plone.org/manage/troubleshooting/manual-remove-utility.html page.

Lots of people in the forum are running into problems that can be solved with it, but don't know about it, or perhaps they need more examples on how to use it, e.g. https://community.plone.org/t/cleaning-up-a-wicked-mess/