DOC : fixed reference in var.is_stable()
DOC : fixed reference in var.is_stable()


Former-commit-id: 71dfcf4a2b2c842b958a0bb7d77a2445c7996e59
cbrnr/scot,mbillingr/SCoT,mbillingr/SCoT,cbrnr/scot,scot-dev/scot,scot-dev/scot,cle1109/scot,cle1109/scot