Guidebook.mn #extended commands

Guidebook.mn #extended commands

Change the extended command section from a mixture of
|#cmd This is a short-named command.
|#command
|     This is a long-named command.
to every command having its descriptive text start on the next line
|#cmd
|     This is a short-named command.
|#command
|     This is a long-named command.
which results in a longer document but the extended commands section
is much easier to read.

No change to Guidebook.txt, where the previous command name padding
was wide enough to accomplish the same for fixed-width tty font.
There is an update to that though; a previous change omitted it.