Merge pull request cerebral#253 from jkleiser/patch-1

Update action.md

Author: christianalfoni

packages/overmind-website/api/action.md

@@ -4,7 +4,7 @@
 h(Example, { name: "api/action"})
 ```
 
-An action is where you write the logic of the application. Every action receives at least on argument and that is the **context**. This is the signature of the context:
+An action is where you write the logic of the application. Every action receives at least one argument and that is the **context**. This is the signature of the context:
 
 `{ state, actions, effects }`
 
@@ -22,4 +22,4 @@ h(Example, { name: "api/action_payload"})
 
 ```marksy
 h(Notice, null, "There is only one argument, which means if you want to pass multiple values you have to do so with an object")
-```
+```