fix(types): fix vm.$once argument type (#8995)
fix(types): fix vm.$once argument type (#8995)

vm.$once should accept an event or array of events as first parameter.

fix #8983
vuejs/vue,vuejs/vue,cnchanning/vue,vuejs/vue,cnchanning/vue,Jinjiang/vue,cnchanning/vue,Jinjiang/vue,vuejs/vue,Jinjiang/vue,Jinjiang/vue