> Use one of the related Emacs commands, and Emacs will do that for you.
> Those commands are described in CONTRIBUTE under "Generating ChangeLog
> entries".

I'm having some issues doing that because I'm using magit to amend /
reword previously committed changes, so the instructions there don't
quite match my situation. Will try harder later, for now I just
modified the message after some examples in your git log. Hope it's ok
now.