lib/msun: Added fmaximum_mag and fmaximum_num families

Added support for the f{maximum,minimum}_{mag,num} families, the new
C23 standard functions for maximum magnitude and number-preferring
maximum

lib/msun: Added fmaximum_mag and fmaximum_num families

Added support for the f{maximum,minimum}_{mag,num} families, the new
C23 standard functions for maximum magnitude and number-preferring
maximum. This includes modifying fmax.3, on top of D56230, to
recommend the use of fmaximum_num and fminimum_num.

Reviewed by: fuz, kargl
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D56236

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