Order spec

MSP-11622

Sort specs by describe/context name so it is easier to see if a method
has no specs.
Spec methods Msf::Ui::Console::CommandDispatcher::Db responds to

MSP-11622
Add a don't to CONTRIBUTING about merge messages

Also updated the wiki with an example message to allay any confusion
about avoiding the default merge message.

http://r-7.co/MSF-Landing-PRs

Also fix an italics where it should have been bold.
Land #4223, specs for DB console command output

Wrap specs around current behavior of the DB command dispatcher,
in order to make upcoming refactor painless.

MSP-11622 #land
Land #4231, more explicit instructs on commit msgs

Explicitly reminds people to be wary of default (merge) messages from
Git when landing PRs on Metasploit.