Clarify javadoc on routing tier.
Clarify javadoc on routing tier.

PratikDeshpande/voldemort,gnb/voldemort,rickbw/voldemort,squarY/voldemort,jalkjaer/voldemort,jalkjaer/voldemort,jeffpc/voldemort,null-exception/voldemort,bhasudha/voldemort,birendraa/voldemort,LeoYao/voldemort,stotch/voldemort,jwlent55/voldemort,FelixGV/voldemort,cshaxu/voldemort,HB-SI/voldemort,stotch/voldemort,dallasmarlow/voldemort,jwlent55/voldemort,mabh/voldemort,dallasmarlow/voldemort,jwlent55/voldemort,HB-SI/voldemort,squarY/voldemort,jeffpc/voldemort,null-exception/voldemort,voldemort/voldemort,dallasmarlow/voldemort,voldemort/voldemort,gnb/voldemort,squarY/voldemort,jeffpc/voldemort,null-exception/voldemort,medallia/voldemort,mabh/voldemort,arunthirupathi/voldemort,rickbw/voldemort,cshaxu/voldemort,voldemort/voldemort,squarY/voldemort,medallia/voldemort,arunthirupathi/voldemort,rickbw/voldemort,voldemort/voldemort,jalkjaer/voldemort,bitti/voldemort,medallia/voldemort,mabh/voldemort,jalkjaer/voldemort,cshaxu/voldemort,FelixGV/voldemort,jalkjaer/voldemort,bitti/voldemort,squarY/voldemort,cshaxu/voldemort,dallasmarlow/voldemort,mabh/voldemort,medallia/voldemort,birendraa/voldemort,bitti/voldemort,stotch/voldemort,FelixGV/voldemort,PratikDeshpande/voldemort,null-exception/voldemort,bhasudha/voldemort,LeoYao/voldemort,HB-SI/voldemort,null-exception/voldemort,FelixGV/voldemort,FelixGV/voldemort,squarY/voldemort,PratikDeshpande/voldemort,arunthirupathi/voldemort,bitti/voldemort,birendraa/voldemort,cshaxu/voldemort,medallia/voldemort,medallia/voldemort,HB-SI/voldemort,jeffpc/voldemort,PratikDeshpande/voldemort,HB-SI/voldemort,squarY/voldemort,bhasudha/voldemort,FelixGV/voldemort,bhasudha/voldemort,birendraa/voldemort,arunthirupathi/voldemort,arunthirupathi/voldemort,jalkjaer/voldemort,FelixGV/voldemort,bhasudha/voldemort,null-exception/voldemort,bitti/voldemort,cshaxu/voldemort,dallasmarlow/voldemort,arunthirupathi/voldemort,stotch/voldemort,birendraa/voldemort,LeoYao/voldemort,LeoYao/voldemort,arunthirupathi/voldemort,LeoYao/voldemort,mabh/voldemort,jalkjaer/voldemort,birendraa/voldemort,stotch/voldemort,HB-SI/voldemort,bhasudha/voldemort,rickbw/voldemort,jwlent55/voldemort,gnb/voldemort,LeoYao/voldemort,rickbw/voldemort,stotch/voldemort,bitti/voldemort,mabh/voldemort,jwlent55/voldemort,voldemort/voldemort,rickbw/voldemort,gnb/voldemort,bitti/voldemort,PratikDeshpande/voldemort,dallasmarlow/voldemort,jeffpc/voldemort,gnb/voldemort,jeffpc/voldemort,PratikDeshpande/voldemort,voldemort/voldemort,voldemort/voldemort,gnb/voldemort,jwlent55/voldemort