K 10
svn:author
V 3
0mp
K 8
svn:date
V 27
2021-08-15T21:16:44.536294Z
K 7
svn:log
V 476
grep: Fix an incorrect description of the -C flag

It seems that the number of lines is no longer an optional parameter to
the -C flag. Document it accordingly both in the manual page and the
usage message.

Reviewed by:	yuripv
Approved by:	yuripv
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D28509

(cherry picked from commit be6b8b7a3a18acb3b044e144d946392fca05e5d0)

Git Hash:   90146cfa3180ee6f8e183f3fb31cdde2e4fc6417
Git Author: 0mp@FreeBSD.org
END