There is no documented way to do this. Instead the description of the publish markup says that you will often need to leave an empty comment line to start new markup, implying that Yup, they know there isn't anything you can put in to say "End of what was going on" or "Start of something new not part of what was going on."
You simply place comments at the top of the function. All comments that appear before the first non-comment or empty line are displayed when you type "help ..."
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