IMPALA-7575: [DOCS] FMOD() is not the same as the % operator
IMPALA-7575: [DOCS] FMOD() is not the same as the % operator

- Removed the text about FMOD being equivalent to %.
- Added a note that MOD will show as % in the query plan.

Change-Id: I3b02d3e3f556d93e1d651eaee12217d6b0e3f9e0
Reviewed-on: http://gerrit.cloudera.org:8080/11586
Reviewed-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>
Tested-by: Impala Public Jenkins <039b6b20426ff68ebe492b3021890d8c8fd010c9@cloudera.com>

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