docs: CLOUD-552: document auth-method config
docs: CLOUD-552: document auth-method config

josefkarasek/application-templates,bdecoste/application-templates,douglaspalmer/application-templates,kyguy/application-templates,rcernich/application-templates,jboss-openshift/application-templates,errantepiphany/application-templates,bparees/application-templates,knrc/application-templates