[docs] main.py: junit documentation elaboration #19867
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Elaborate on the information given in --help and command_line.rst for junit, to make it more correct and comprehensive.
I manually examined the generated results and found them satisfactory.
Note that this also puts --junit-format into misc group not import group; the inclusion into imports group seems to have been a mistake in #16388 although one could perhaps argue it is tangentially related to imports in some way. But it does not influence import discovery, unlike the other options. Putting it into import group also makes it display in a completely different place, which is not as helpful as right next to its related option.