Documentation: simpler shared repository creation

Documentation: simpler shared repository creation

Take Johannes Schindelin's suggestions for a further simplification of
the shared repository creation using git --bare init-db --shared, and
for a simplified cvsimport using an existing CVS working directory.

Also insert more man page references.

Signed-off-by: J. Bruce Fields <redacted>
 cvs-migration.txt |   27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)
Signed-off-by: Junio C Hamano <redacted>