13699 strtod(3c)/wcstod(3c) man pages should mention math.h

Review Request #2584 — Created April 6, 2021 and updated

marcel
illumos-gate
master
13699
76176cd...
general
This adds reference to math.h into both strtod(3c) and wcstod(3c) man pages so
reader is no longer confused where the HUGE_* values comes from.
I reviewed the manpages using the following commands:

MANPATH=usr/src/man man strtod
MANPATH=usr/src/man man wcstod

Nightly passed.
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