IMPALA-6623: [DOCS] ltrim and rtrim docs updated
IMPALA-6623: [DOCS] ltrim and rtrim docs updated

Change-Id: If4f7a04e3c64eade7a23cded21de5ff91c9c8c8c
Reviewed-on: http://gerrit.cloudera.org:8080/9984
Reviewed-by: Zoram Thanga <7fb87db2af3a4d8d5d7fa9734e75ebb8d6af0a57@cloudera.com>
Reviewed-by: Alex Rodoni <b46da68bf9b818cec7052f7cdfe9b3e69485676b@cloudera.com>
Tested-by: Impala Public Jenkins <039b6b20426ff68ebe492b3021890d8c8fd010c9@cloudera.com>

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