IMPALA-5383: [DOCS] Document unpartitioned Kudu tables
IMPALA-5383: [DOCS] Document unpartitioned Kudu tables

Change-Id: Ia2b466e1e482d62de84253c0cb406668fd5ad5eb
Reviewed-on: http://gerrit.cloudera.org:8080/8180
Reviewed-by: Alex Behm <fe1626037acfc2dc542d2aa723a6d14f2464a20c@cloudera.com>
Tested-by: Impala Public Jenkins

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala