kevinyu98 opened a new pull request #25549: [SPARK-28828][DOC] Document REFRESH 
TABLE command
URL: https://github.com/apache/spark/pull/25549
 
 
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   ### What changes were proposed in this pull request?
   Document REFRESH TABLE statement in the SQL Reference Guide.
   
   
   ### Why are the changes needed?
   Currently there is no documentation in the SPARK SQL to describe how to use 
this command, it is to address this issue.
   
   
   ### Does this PR introduce any user-facing change?
   Yes.
   #### Before:
   There is no documentation for this.
   
   #### After:
   ![Screen Shot 2019-08-21 at 10 33 46 
PM](https://user-images.githubusercontent.com/7550280/63488916-7084c080-c465-11e9-9b8d-e7dca8f23069.png)
   
   
   
   ### How was this patch tested?
   Using jykll build --serve

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