Fix: arguments for getters missing in API (#331)
Fix: arguments for getters missing in API (#331)

* Fix: arguments for getters missing in API

as per `v2.0.0-rc.3`, getters receive 3 arguments: `state, getters, rootState`. However only the first is currently documented. This PR fixes this.

* Update api.md

fix grammar

* remove ")"

vuejs/vuex,vuejs/vuex