fix vue component require syntax for modern vue-loader (#665)

vuejs-jp-bot · kazupon · commit c593e8863325 · 2018-01-25T18:17:13.000+09:00
diff --git a/src/v2/guide/components.md b/src/v2/guide/components.md
@@ -1329,7 +1329,7 @@ Failed to mount component: template or render function not defined.
 
 ``` js
 beforeCreate: function () {
-  this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue')
+  this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue').default
 }
 ```
 

Original file line number	Diff line number	Diff line change
`@@ -1329,7 +1329,7 @@ Failed to mount component: template or render function not defined.`
`1329`	`1329`
`1330`	`1330`	``` js
`1331`	`1331`	`beforeCreate: function () {`
`1332`		`- this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue')`
	`1332`	`+ this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue').default`
`1333`	`1333`	`}`
`1334`	`1334`	```
`1335`	`1335`