Trivial:  fix the GenerateShardRanges vtctl[client] help
Trivial:  fix the GenerateShardRanges vtctl[client] help

Signed-off-by: Jacques Grove <cd08d3adda01607dd857ba479d6e291b9b358911@gmail.com>

vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess