Overly strict warning ‘Unrecognized parameter passing direction’

[MJCollett]

The tag @param[inout] in a doxygen comment triggers the clang warning

Unrecognized parameter passing direction, valid directions are ‘[in]’, ‘[out]’ and ‘[in,out]’

But the doxygen documentation explicitly states that

For the bidirecional values, directions “in” and “out” can be specified in any order, and they can either be written altogether, or separated with a comma (,) or a space. That means that for example values “[outin]” or “[in out]” are also valid.

If this were in my own code, I’d just shrug and insert the comma. But it’s in a third party header, and I’m not inclined to make a bug report to that header’s owner when it is correct according to the docs. So I'm reporting it here instead.