Update Siddhi kubernetes user doc
Update Siddhi kubernetes user doc

ramindu90/siddhi,mohanvive/siddhi,tishan89/siddhi,mohanvive/siddhi,suhothayan/siddhi,ramindu90/siddhi,gokul/siddhi,tishan89/siddhi,dilini-muthumala/siddhi,grainier/siddhi,suhothayan/siddhi,grainier/siddhi,dilini-muthumala/siddhi,gokul/siddhi,wso2/siddhi,wso2/siddhi