Fixed the examples option

[sho-luv]

There is a misleading -h option printed in the examples. However, the real option is -t. I was like this doesn't work until I realized what was going on.

[busterb]

Sure, I can merge this, but note that this is not my original code. I just imported it from Nick Powers' last dump.

The code here is also present in Metasploit framework as 3 modules.

auxiliary/scanner/msmail/exchange_enum auxiliary/scanner/msmail/host_id auxiliary/scanner/msmail/onprem_enum