This was written by an editor who does not know that "its" should be "it's".
Good catch, I was going to berate them on that but I wasn't sure if this was the illiterate moron's fault or some O'Reilly transcriber's.
I guess O'Reilly should correct it if it's their fault or else they should put [sic] after the error on their website.
Awk! I missed that one. Page One of Strunk and White!
d.o.l.
Criminal Number 18F