Fix bug in store pattern example (vuejs#732)

MattRix · chrisvfritz · commit 4a82ff3be41b · 2017-01-27T11:42:41.000-05:00
Seems like clearMessageAction should clear the message, not set it to the same thing as the log message.
diff --git a/src/v2/guide/state-management.md b/src/v2/guide/state-management.md
@@ -44,7 +44,7 @@ var store = {
   },
   clearMessageAction () {
     this.debug && console.log('clearMessageAction triggered')
-    this.state.message = 'clearMessageAction triggered'
+    this.state.message = ''
   }
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -44,7 +44,7 @@ var store = {`
`44`	`44`	`},`
`45`	`45`	`clearMessageAction () {`
`46`	`46`	`this.debug && console.log('clearMessageAction triggered')`
`47`		`- this.state.message = 'clearMessageAction triggered'`
	`47`	`+ this.state.message = ''`
`48`	`48`	`}`
`49`	`49`	`}`
`50`	`50`	```