[MERGE][Bug #124853] bzr help debug should list debug options

[Ian Clatworthy]

Martin Pool wrote:
> Martin Pool has voted tweak.
> Status is now: Approved
> Comment:
> Please make the capitalization consistent with the other items in this
> message.  It would also be a good idea to add a comment in eg debug.py
> or HACKING saying that this topic should be updated when new flags are
> added.

I had just approved this a few minutes earlier. I did fix the
capitalisation as part of merging. I'll add a comment to debug.py as a
separate trivial change later today.

Ian C.