Style question (and other things)

I was considering attempting to join the doc team just now, mainly to work on inconsistencies in style of writing or unprofessional wording, but thankfully a message was posted yesterday by another person wishing to join, so now I know how to go about it. In any case, before I get started on that, I have a question about something I found at http://php.net/manual/en/control-structures.switch.php regarding the two Note blocks near the beginning of the page. Is it proper (or conforming to a MoS) for a Note block to say "Note:" followed by "Note that ..."? Seems a bit redundant. I haven't noticed yet if this appears anywhere else.