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syscons.4,vt.4: update kern.vty description reflecting vt as default

Description

syscons.4,vt.4: update kern.vty description reflecting vt as default

rS274085 made vt(4) the default system console. Catch up to this in
the man page description for the kern.vty tunable.

Reviewed by: bz
Approved by: re (hrs)
Differential Revision: https://reviews.freebsd.org/D6901