update link prefetch syntax in examples (vercel#1276)

Author: sedubois

examples/data-fetch/pages/index.js

@@ -1,6 +1,6 @@
 
 import React from 'react'
-import Link from 'next/prefetch'
+import Link from 'next/link'
 import 'isomorphic-fetch'
 
 export default class MyPage extends React.Component {
@@ -15,7 +15,7 @@ export default class MyPage extends React.Component {
     return (
       <div>
         <p>Next.js has {this.props.stars} ⭐️</p>
-        <Link href='/preact'><a>How about preact?</a></Link>
+        <Link prefetch href='/preact'><a>How about preact?</a></Link>
       </div>
     )
   }

examples/data-fetch/pages/preact.js

@@ -1,6 +1,6 @@
 
 import React from 'react'
-import Link from 'next/prefetch'
+import Link from 'next/link'
 import 'isomorphic-fetch'
 
 export default class MyPage extends React.Component {
@@ -15,7 +15,7 @@ export default class MyPage extends React.Component {
     return (
       <div>
         <p>Preact has {this.props.stars} ⭐️</p>
-        <Link href='/'><a>I bet next has more stars (?)</a></Link>
+        <Link prefetch href='/'><a>I bet next has more stars (?)</a></Link>
       </div>
     )
   }

examples/using-inferno/pages/index.js

@@ -1,6 +1,6 @@
 import React from 'react'
-import Link from 'next/prefetch'
+import Link from 'next/link'
 
 export default () => (
-  <div>Hello World. <Link href='/about'><a>About</a></Link></div>
+  <div>Hello World. <Link prefetch href='/about'><a>About</a></Link></div>
 )

examples/with-apollo/components/Header.js

@@ -1,12 +1,12 @@
-import Link from 'next/prefetch'
+import Link from 'next/link'
 
 export default ({ pathname }) => (
   <header>
-    <Link href='/'>
+    <Link prefetch href='/'>
       <a className={pathname === '/' && 'is-active'}>Home</a>
     </Link>
 
-    <Link href='/about'>
+    <Link prefetch href='/about'>
       <a className={pathname === '/about' && 'is-active'}>About</a>
     </Link>
 

examples/with-flow/types/next.js.flow

@@ -24,12 +24,6 @@ declare module "next/error" {
   declare module.exports: Class<React$Component<void, {statusCode: number}, any>>;
 }
 
-declare module "next/prefetch" {
-  declare export var prefetch: (url: string) => any;
-  declare export var reloadIfPrefetched: any;
-  declare export default Class<React$Component<void, {href: string, prefetch?: boolean}, any>>;
-}
-
 declare module "next/router" {
   declare module.exports: {
     route: string;