Rename PG Example for flatten in flux #214 #218
                
     Merged
            
            
          
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https://metafacture.org/playground/?example=flatten always links to the fix function. So I adjusted the name of flatten to enable to link to the flux command.
If okay I also have to adjust https://github.com/metafacture/metafacture-documentation/blob/master/linksAndExamples.tsv
Resolves #214.