unexpected behavior

[Edgar Pettijohn]

I think this may be normal, but I can't seem to find it documented 
anywhere.  While viewing a man page in xterm if I hit the 'v' key it 
appears to open it for editing in vi. I did so accidentally recently and 
at first I thought I broke something because of all the 
"F^HFI^HIL^HLE^,etc" which I assume are man markup characters. I looked 
around for documentation on this "feature", but I'm not sure where to 
look vi, mandoc, xterm? So is this a bug somewhere or expected behavior?

Thanks,

Edgar