[Midnightbsd-cvs] src: env.1: document the new option in env -u name

[laffer1 at midnightbsd.org]

Log Message:
-----------
document the new option in env -u name

Modified Files:
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    src/usr.bin/env:
        env.1 (r1.2 -> r1.3)
        (http://cvsweb.midnightbsd.org/src/usr.bin/env/env.1?r1=1.2&r2=1.3)