change some terms in architecture.md (#728)
change some terms in architecture.md (#728)


kubeless/kubeless,sebgoa/kubeless,skippbox/kubeless,sebgoa/kubeless,skippbox/kubeless,sebgoa/kubeless,sebgoa/kubeless,sebgoa/kubeless,sebgoa/kubeless,skippbox/kubeless,sebgoa/kubeless,kubeless/kubeless,sebgoa/kubeless,skippbox/kubeless,kubeless/kubeless