Add some comments for import function (#1202)

Justineo · chrisvfritz · commit a7b6d9e32603 · 2017-10-12T11:48:57.000-04:00
...in case some readers are not familiar with it.
diff --git a/src/v2/guide/components.md b/src/v2/guide/components.md
@@ -1150,6 +1150,7 @@ You can also return a `Promise` in the factory function, so with Webpack 2 + ES2
 ``` js
 Vue.component(
   'async-webpack-example',
+  // The `import` function returns a `Promise`.
   () => import('./my-async-component')
 )
 ```

Original file line number	Diff line number	Diff line change
@@ -1150,6 +1150,7 @@ You can also return a `Promise` in the factory function, so with Webpack 2 + ES2
`1150`	`1150`	``` js
`1151`	`1151`	`Vue.component(`
`1152`	`1152`	`'async-webpack-example',`
	`1153`	+ // The `import` function returns a `Promise`.
`1153`	`1154`	`() => import('./my-async-component')`
`1154`	`1155`	`)`
`1155`	`1156`	```