Quoting Operators `2`

I think I've caught every "Nock 6" and changed it to a "Nock `6`",
I've also reformatted some text that was outside of 80col boundary
near a 'Nock'.  If you demand to have these two submitted separately,
it will probably result in a more thorough review of these chapters...
Merge pull request #25 from yebyen/master

Quoting Operators `2`