fix example using-router import wrong pathname

[armspkt]

About page import wrong pathname causing warning like this.

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
buildDuration	8.4s	8.2s	-141ms
nodeModulesSize	82.6 MB	82.6 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
/ failed reqs	0	0	✓
/ total time (seconds)	1.659	1.692	⚠️ +0.03
/ avg req/sec	1506.94	1477.69	⚠️ -29.25
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.014	1.029	⚠️ +0.01
/error-in-render avg req/sec	2465.78	2429.47	⚠️ -36.31

Client Bundles (main, webpack, commons)

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
677f882d2ed8..5e70.js gzip	12.8 kB	12.8 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-e0d2962..b163.js gzip	6.56 kB	6.56 kB	✓
webpack-95c2..e870.js gzip	751 B	751 B	✓
Overall change	59 kB	59 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
polyfills-d3..23f6.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
_app-0d19cb6..5497.js gzip	1.28 kB	1.28 kB	✓
_error-85785..a9f3.js gzip	3.44 kB	3.44 kB	✓
hooks-42456f..0c06.js gzip	887 B	887 B	✓
index-8081ce..e44f.js gzip	227 B	227 B	✓
link-0ab9f83..fa00.js gzip	1.61 kB	1.61 kB	✓
routerDirect..c3d8.js gzip	303 B	303 B	✓
withRouter-0..a68e.js gzip	302 B	302 B	✓
Overall change	8.05 kB	8.05 kB	✓

Client Build Manifests

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
_buildManifest.js gzip	323 B	323 B	✓
Overall change	323 B	323 B	✓

Rendered Page Sizes

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
index.html gzip	612 B	612 B	✓
link.html gzip	620 B	620 B	✓
withRouter.html gzip	607 B	607 B	✓
Overall change	1.84 kB	1.84 kB	✓

---

Serverless Mode

General

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
buildDuration	10s	9.8s	-241ms
nodeModulesSize	82.6 MB	82.6 MB	✓

Client Bundles (main, webpack, commons)

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
677f882d2ed8..5e70.js gzip	12.8 kB	12.8 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-e0d2962..b163.js gzip	6.56 kB	6.56 kB	✓
webpack-95c2..e870.js gzip	751 B	751 B	✓
Overall change	59 kB	59 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
polyfills-d3..23f6.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
_app-0d19cb6..5497.js gzip	1.28 kB	1.28 kB	✓
_error-85785..a9f3.js gzip	3.44 kB	3.44 kB	✓
hooks-42456f..0c06.js gzip	887 B	887 B	✓
index-8081ce..e44f.js gzip	227 B	227 B	✓
link-0ab9f83..fa00.js gzip	1.61 kB	1.61 kB	✓
routerDirect..c3d8.js gzip	303 B	303 B	✓
withRouter-0..a68e.js gzip	302 B	302 B	✓
Overall change	8.05 kB	8.05 kB	✓

Client Build Manifests

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
_buildManifest.js gzip	323 B	323 B	✓
Overall change	323 B	323 B	✓

Serverless bundles

	vercel/next.js canary	armspkt/next.js fix/using-router-example	Change
_error.js	1 MB	1 MB	✓
404.html	2.67 kB	2.67 kB	✓
hooks.html	1.92 kB	1.92 kB	✓
index.js	1 MB	1 MB	✓
link.js	1.06 MB	1.06 MB	✓
routerDirect.js	1.05 MB	1.05 MB	✓
withRouter.js	1.05 MB	1.05 MB	✓
Overall change	5.16 MB	5.16 MB	✓

Commit: 1a631b0

[Timer]

Thanks!