[issue184] cp add -a document -r

[Antonio Huete Jimenez (via DragonFly issue tracker)]

Antonio Huete Jimenez <tuxillo at quantumachine.net> added the comment:

-r seems to be documented already in cp(1) manpage

"Historic versions of the cp utility had a -r option.  This implementation
supports that option, however, its use is strongly discouraged, as it
does not correctly copy special files, symbolic links or fifo's."

I don't see any opinion about -a option. I will close this ticket soon if no
feedback.

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