HBASE-22097 Modify the description of split command in shell

Signed-off-by: Peter Somogyi <psomogyi@apache.org>
Signed-off-by: Xu Cang <xucang@apache.org>

hbase-shell/src/main/ruby/shell/commands/split.rb

@@ -25,11 +25,12 @@ module Shell
 Split entire table or pass a region to split individual region.  With the
 second parameter, you can specify an explicit split key for the region.
 Examples:
-    split 'tableName'
-    split 'namespace:tableName'
-    split 'regionName' # format: 'tableName,startKey,id'
-    split 'tableName', 'splitKey'
-    split 'regionName', 'splitKey'
+    split 'TABLENAME'
+    split 'REGIONNAME'
+    split 'ENCODED_REGIONNAME'
+    split 'TABLENAME', 'splitKey'
+    split 'REGIONNAME', 'splitKey'
+    split 'ENCODED_REGIONNAME', 'splitKey'
 EOF
       end