Corrected MAC range to 00-9F, removed extra "0" from MAC characters

The Extended MAC range as per the spreadsheet is only from :00 to :9F, not all the way up to :FF. Also, the MAC characters list had "0" listed both at the beginning, as well as after "9".

Some comments referring to manual interface input were also corrected.
Merge pull request #2 from imariaprime/patch-2

Corrected MAC range to 00-9F, removed extra "0" from MAC characters