@OutputType = 'markdown' generates 'illegal name character'

[rogerdawkins]

Version of the script
8.23

What is the current behavior?
Generates XML parsing: line 64, character 203, illegal name character

If the current behavior is a bug, please provide the steps to reproduce.
Just run sp_Blitz with @OutputType = 'markdown'

What is the expected behavior?

Which versions of SQL Server and which OS are affected by this issue? Did this work in previous versions of our procedures?

By using the @IgnorePrioritiesAbove/Below I was able to limit the error to a priority 200 issue. I then used the SkipChecks with the various Check ID's and narrowed the error down to 'Backup Compression Default Off'. The reason I suspect is because the Details text includes an ampersand i.e. '... with SQL Server 2008R2 & newer...'.