Since this is a console program, ctrl + letter gets mapped to a
control character in the range 1 to 26. Most of these control
characters are no longer in use and can safely be assumed to be
result of ctrl + letter, but ^I maps to the tab character.
I chose ^G since the keybind is memorable, and a user is unlikely
to try to type the BEL character.
roff(7) dictates that "Each sentence should terminate at the end of an
input line." Instead of doing this, Sortix manpages (incorrectly) used
double-spaces to separate sentences.
Additionally, fix a few small typos.
