[docs] fix invalid example json (#5547)
[docs] fix invalid example json (#5547)

https://github.com/druid-io/druid/issues/5546
himanshug/druid,michaelschiff/druid,himanshug/druid,dkhwangbo/druid,nishantmonu51/druid,deltaprojects/druid,monetate/druid,gianm/druid,druid-io/druid,jon-wei/druid,Fokko/druid,gianm/druid,b-slim/druid,gianm/druid,monetate/druid,himanshug/druid,deltaprojects/druid,deltaprojects/druid,pjain1/druid,druid-io/druid,pjain1/druid,monetate/druid,pjain1/druid,Fokko/druid,implydata/druid,monetate/druid,nishantmonu51/druid,druid-io/druid,jon-wei/druid,leventov/druid,monetate/druid,pjain1/druid,Fokko/druid,nishantmonu51/druid,pjain1/druid,knoguchi/druid,Fokko/druid,implydata/druid,michaelschiff/druid,implydata/druid,leventov/druid,gianm/druid,druid-io/druid,mghosh4/druid,Fokko/druid,pjain1/druid,deltaprojects/druid,jon-wei/druid,dkhwangbo/druid,gianm/druid,mghosh4/druid,liquidm/druid,mghosh4/druid,pjain1/druid,himanshug/druid,gianm/druid,implydata/druid,monetate/druid,jon-wei/druid,jon-wei/druid,michaelschiff/druid,monetate/druid,b-slim/druid,dkhwangbo/druid,Fokko/druid,dkhwangbo/druid,leventov/druid,deltaprojects/druid,mghosh4/druid,himanshug/druid,mghosh4/druid,nishantmonu51/druid,leventov/druid,knoguchi/druid,implydata/druid,nishantmonu51/druid,gianm/druid,liquidm/druid,b-slim/druid,deltaprojects/druid,leventov/druid,b-slim/druid,mghosh4/druid,nishantmonu51/druid,michaelschiff/druid,mghosh4/druid,liquidm/druid,michaelschiff/druid,dkhwangbo/druid,liquidm/druid,jon-wei/druid,michaelschiff/druid,jon-wei/druid,knoguchi/druid,liquidm/druid,liquidm/druid,knoguchi/druid,b-slim/druid,michaelschiff/druid,implydata/druid,Fokko/druid,nishantmonu51/druid,knoguchi/druid,druid-io/druid,deltaprojects/druid