[SPARK-11689] [ML] Add user guide and example code for LDA under spark.ml #9974
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jira: https://issues.apache.org/jira/browse/SPARK-11689
Add simple user guide for LDA under spark.ml and example code under examples/. Use include_example to include example code in the user guide markdown. Check SPARK-11606 for instructions.
Original PR is reverted due to document build error. #9722
@mengxr @feynmanliang @yinxusen Sorry for the troubling.