[DOCS] Added the hotspot analysis to Performance Best Practices doc
[DOCS] Added the hotspot analysis to Performance Best Practices doc

Change-Id: Iffc96004aea121e73065466a39b012a0d6556095
Reviewed-on: http://gerrit.cloudera.org:8080/10472
Reviewed-by: Alan Choi <91e38e63b890fbb214c8914809fde03c73e7f24d@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