[DOCS] Fixed typos in impala_math_functions examples
[DOCS] Fixed typos in impala_math_functions examples

Change-Id: Iebe1412e0a84016f82861d1ca9bd916e185d7ae6
Reviewed-on: http://gerrit.cloudera.org:8080/12026
Tested-by: Impala Public Jenkins <039b6b20426ff68ebe492b3021890d8c8fd010c9@cloudera.com>
Reviewed-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>

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