Updated config reference to include reference to pluginRole and authConfig. Marked ldap and passwordFile tag to be deprecated
Updated config reference to include reference to pluginRole and authConfig. Marked ldap and passwordFile tag to be deprecated

gocd/docs.go.cd,gocd/docs.go.cd,ketan/docs.go.cd,ketan/docs.go.cd,gocd/docs.go.cd,ketan/docs.go.cd