Change occurence to occurrence (vuejs#655)

Obura Tongoi · kazupon · commit 6a4db36b9fe6 · 2017-02-19T02:13:44.000+09:00
This was causing the following error:

webpack.optimize.OccurenceOrderPlugin is not a constructor
diff --git a/docs/en/workflow/production.md b/docs/en/workflow/production.md
@@ -24,8 +24,8 @@ module.exports = {
         warnings: false
       }
     }),
-    // optimize module ids by occurence count
-    new webpack.optimize.OccurenceOrderPlugin()
+    // optimize module ids by occurrence count
+    new webpack.optimize.OccurrenceOrderPlugin()
   ]
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -24,8 +24,8 @@ module.exports = {`
`24`	`24`	`warnings: false`
`25`	`25`	`}`
`26`	`26`	`}),`
`27`		`- // optimize module ids by occurence count`
`28`		`- new webpack.optimize.OccurenceOrderPlugin()`
	`27`	`+ // optimize module ids by occurrence count`
	`28`	`+ new webpack.optimize.OccurrenceOrderPlugin()`
`29`	`29`	`]`
`30`	`30`	`}`
`31`	`31`	```