cherry-pick-votes-maint: show three-vote commits in green

This makes it clearer that they are expected to be merged, in the absence of
a subsequent veto.
Cherry-pick-votes file improvements

Move XSLT to the end of the file where it's sufficiently out of sight that
it doesn't need to be (almost) on one line (thanks to Aaron Crane for the
suggestion).

Add some <div> tags around the section headers to make it easy to show them
in the HTML page, since it helps make more sense of the long list of
commits to consider.
Take note of 4c0ef20885 in cherry-pick-votes file