fix a few clarical errors and typos

1. Thought it best to make sure people know this relies on FQDN
2. It's the `krbtgt` user's NTLM hash needed, not any ticket/token as far as I know, happy to be proven wrong on this one.
3. When I first read the path I thought it was on target since I was running in a meterpreter session, "local" just helps with a bit of confusion.
4. Think this was just a bad copy pasta job. Small fixes needed
5. Missing 'r' made purge error out with method not found.