f*::min/max: fix comparing with libm and IEEE operations #149563
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What we document actually doesn't match what libm does any more, libm got "fixed"/changed in https://sourceware.org/bugzilla/show_bug.cgi?id=20947. So better remove the remark. Instead, explicitly call out that this is a mix of
minNumandminimumNumber.Also fix the intrinsics which incorrectly claimed to be like
minNum, but their intended SNaN behavior is actually different from that.r? @tgross35