grep(1) documents bsdgrep, but GNU grep is installed as 'grep'

[Rebecca Cran]

grep(1) documents the "--exclude-dir" option, but running "grep" complains 
it's unknown. Also, 'rgrep' doesn't exist.
It turns out that the grep binary is GNU grep 2.5.1, while bsdgrep supports 
the option.

Is WITH_BSD_GREP supposed to be defaulted to on for 12.0 and newer, or was the 
man page switched over too soon?

-- 
Rebecca Cran
bcran at freebsd.org