Mentioning strtonum(3) in style(9)

[Matthew Dillon]

:Hello
:
:There was a recent style(9) commit regarding the use of safe functions, so
:I guess strtonum(3) should be mentioned too. Below is a patch, though
:someone who speaks english better than me will probably come up with
:better wording...

    I don't really like strtonum(), actually.  It makes the mistake of
    trying to integrate a number of things into a single function call
    that really ought to be more explicitly checked after the call returns.

						-Matt