[Issue] Test-ExchAVExclusions - typo in script / output

[BoBeB]

Describe the issue
Version 22.11.07.2248 - typo on line 255 "witness" is spelt incorrectly (in the script its "Witeness)

Expected behavior
Test-ExchAVExclusions
typo on line 255 "witness" is spelt incorrectly (in the script its "Witeness)

Script Output
If applicable, add the exception that wasn't handled.
"WARNING: Remember to add the witeness directory"
Additional context
Add any other context about the problem here.