docs: Added copy to clarify context (vuejs#1444)

Although it is mentioned further down the document; I think this line will make it more clear especially for newcomers of vuex. I see similar questions regarding this like https://stackoverflow.com/questions/45848974/call-an-action-from-within-another-action

Author: talentedunicorn

docs/guide/actions.md

@@ -25,7 +25,7 @@ const store = new Vuex.Store({
 })
 ```
 
-Action handlers receive a context object which exposes the same set of methods/properties on the store instance, so you can call `context.commit` to commit a mutation, or access the state and getters via `context.state` and `context.getters`. We will see why this context object is not the store instance itself when we introduce [Modules](modules.md) later.
+Action handlers receive a context object which exposes the same set of methods/properties on the store instance, so you can call `context.commit` to commit a mutation, or access the state and getters via `context.state` and `context.getters`. We can even call other actions with `context.dispatch`. We will see why this context object is not the store instance itself when we introduce [Modules](modules.md) later.
 
 In practice, we often use ES2015 [argument destructuring](https://github.com/lukehoban/es6features#destructuring) to simplify the code a bit (especially when we need to call `commit` multiple times):