docs: Minor typo fix for Actions docs page. (#1606)

docs/guide/actions.md

@@ -47,7 +47,7 @@ Actions are triggered with the `store.dispatch` method:
 store.dispatch('increment')
 ```
 
-This may look silly at first sight: if we want to increment the count, why don't we just call `store.commit('increment')` directly? Remember that **mutations have to be synchronous**? Actions don't. We can perform **asynchronous** operations inside an action:
+This may look silly at first sight: if we want to increment the count, why don't we just call `store.commit('increment')` directly? Remember that **mutations have to be synchronous**. Actions don't. We can perform **asynchronous** operations inside an action:
 
 ``` js
 actions: {