HBASE-22097 Modify the description of split command in shell
HBASE-22097 Modify the description of split command in shell

Signed-off-by: Peter Somogyi <dfe29050aae9e16fc6784bf10581623b02587478@apache.org>
Signed-off-by: Xu Cang <3924b5dc102500c76938337ad583f5f9d57bc1e8@apache.org>

HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase,HubSpot/hbase