Correct doc for Kafka raw decoder
Correct doc for Kafka raw decoder

The documentation of raw message/key decoder in kafka was messed up.
It stated that `mapping` represented width of data type which actually
is specified via the `dataFormat` property.
Also `formatHint` was used instead `mapping`.

hgschmie/presto,treasure-data/presto,Teradata/presto,elonazoulay/presto,zzhao0/presto,yuananf/presto,martint/presto,stewartpark/presto,jxiang/presto,mvp/presto,smartnews/presto,ptkool/presto,prateek1306/presto,EvilMcJerkface/presto,ebyhr/presto,sopel39/presto,gh351135612/presto,smartnews/presto,electrum/presto,losipiuk/presto,jxiang/presto,miniway/presto,yuananf/presto,nezihyigitbasi/presto,youngwookim/presto,Teradata/presto,hgschmie/presto,Praveen2112/presto,shixuan-fan/presto,facebook/presto,sopel39/presto,losipiuk/presto,twitter-forks/presto,treasure-data/presto,11xor6/presto,11xor6/presto,dain/presto,elonazoulay/presto,arhimondr/presto,yuananf/presto,shixuan-fan/presto,youngwookim/presto,nezihyigitbasi/presto,martint/presto,ebyhr/presto,hgschmie/presto,Yaliang/presto,gh351135612/presto,miniway/presto,raghavsethi/presto,nezihyigitbasi/presto,ptkool/presto,11xor6/presto,martint/presto,ptkool/presto,miniway/presto,martint/presto,twitter-forks/presto,hgschmie/presto,sopel39/presto,dain/presto,jxiang/presto,smartnews/presto,prateek1306/presto,elonazoulay/presto,arhimondr/presto,erichwang/presto,dain/presto,erichwang/presto,wyukawa/presto,Yaliang/presto,ptkool/presto,raghavsethi/presto,stewartpark/presto,haozhun/presto,facebook/presto,facebook/presto,treasure-data/presto,gh351135612/presto,gh351135612/presto,ebyhr/presto,stewartpark/presto,Teradata/presto,yuananf/presto,Yaliang/presto,Praveen2112/presto,haozhun/presto,jxiang/presto,wyukawa/presto,shixuan-fan/presto,zzhao0/presto,prestodb/presto,arhimondr/presto,prestodb/presto,treasure-data/presto,twitter-forks/presto,gh351135612/presto,ebyhr/presto,zzhao0/presto,elonazoulay/presto,twitter-forks/presto,haozhun/presto,mvp/presto,elonazoulay/presto,hgschmie/presto,twitter-forks/presto,martint/presto,electrum/presto,haozhun/presto,nezihyigitbasi/presto,sopel39/presto,erichwang/presto,nezihyigitbasi/presto,miniway/presto,haozhun/presto,prateek1306/presto,raghavsethi/presto,EvilMcJerkface/presto,wyukawa/presto,Teradata/presto,Teradata/presto,raghavsethi/presto,prestodb/presto,smartnews/presto,raghavsethi/presto,Praveen2112/presto,zzhao0/presto,Praveen2112/presto,electrum/presto,youngwookim/presto,electrum/presto,arhimondr/presto,facebook/presto,ebyhr/presto,EvilMcJerkface/presto,arhimondr/presto,facebook/presto,shixuan-fan/presto,prestodb/presto,yuananf/presto,mvp/presto,youngwookim/presto,mvp/presto,erichwang/presto,mvp/presto,Yaliang/presto,dain/presto,11xor6/presto,Praveen2112/presto,smartnews/presto,wyukawa/presto,prestodb/presto,prateek1306/presto,electrum/presto,treasure-data/presto,Yaliang/presto,EvilMcJerkface/presto,losipiuk/presto,jxiang/presto,EvilMcJerkface/presto,11xor6/presto,treasure-data/presto,losipiuk/presto,miniway/presto,youngwookim/presto,prestodb/presto,dain/presto,shixuan-fan/presto,erichwang/presto,stewartpark/presto,wyukawa/presto,losipiuk/presto,stewartpark/presto,zzhao0/presto,sopel39/presto,ptkool/presto,prateek1306/presto