Add DocBook manual pages for commands that do not have a manual page yet. Also
add a page for koha-common itself, listing all the available commands.
Signed-off-by: Robin Sheat <robin@catalyst.net.nz>
Minor change: I fixed a typo I spotted
(cherry picked from commit fab2d8b0ab)
Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>