Fixed link for expo

[kmkzt]

The link was broken, so I changed it.

https://github.com/expo/expo/blob/master/docs/pages/guides/using-nextjs.md

[ijjk]

Stats from current PR

Default Server Mode (Increase detected ⚠️)

General

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
buildDuration	13.2s	13.6s	⚠️ +420ms
nodeModulesSize	64.3 MB	64.3 MB	✓

Page Load Tests Overall increase ✓

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.622	2.531	-0.09
/ avg req/sec	953.56	987.61	+34.05
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.585	1.502	-0.08
/error-in-render avg req/sec	1577.4	1664.88	+87.48

Client Bundles (main, webpack, commons)

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
677f882d2ed8..133b.js gzip	11.1 kB	11.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-3fae807..efe0.js gzip	7.3 kB	7.3 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	58.1 kB	58.1 kB	✓

Client Bundles (main, webpack, commons) Modern

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
677f882d2ed8..dule.js gzip	6.9 kB	6.9 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
main-8ac5189..dule.js gzip	6.29 kB	6.29 kB	✓
webpack-07c5..dule.js gzip	751 B	751 B	✓
Overall change	52.9 kB	52.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
_app-9a0b9e1..b37e.js gzip	1.28 kB	1.28 kB	✓
_error-ed1b0..8fbd.js gzip	3.44 kB	3.44 kB	✓
hooks-89731c..c609.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-409b283..e3ab.js gzip	1.32 kB	1.32 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	7.73 kB	7.73 kB	✓

Client Pages Modern

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
_app-75d3a82..dule.js gzip	625 B	625 B	✓
_error-4469a..dule.js gzip	2.29 kB	2.29 kB	✓
hooks-cbf13f..dule.js gzip	387 B	387 B	✓
index-b9a643..dule.js gzip	226 B	226 B	✓
link-92d3016..dule.js gzip	1.28 kB	1.28 kB	✓
routerDirect..dule.js gzip	284 B	284 B	✓
withRouter-f..dule.js gzip	282 B	282 B	✓
Overall change	5.37 kB	5.37 kB	✓

Client Build Manifests

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
_buildManifest.js gzip	323 B	323 B	✓
_buildManife..dule.js gzip	329 B	329 B	✓
Overall change	652 B	652 B	✓

Rendered Page Sizes

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
index.html gzip	1 kB	1 kB	✓
link.html gzip	1.01 kB	1.01 kB	✓
withRouter.html gzip	995 B	995 B	✓
Overall change	3.01 kB	3.01 kB	✓

---

Serverless Mode

General

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
buildDuration	15.1s	15s	-126ms
nodeModulesSize	64.3 MB	64.3 MB	✓

Client Bundles (main, webpack, commons)

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
677f882d2ed8..133b.js gzip	11.1 kB	11.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-3fae807..efe0.js gzip	7.3 kB	7.3 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	58.1 kB	58.1 kB	✓

Client Bundles (main, webpack, commons) Modern

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
677f882d2ed8..dule.js gzip	6.9 kB	6.9 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
main-8ac5189..dule.js gzip	6.29 kB	6.29 kB	✓
webpack-07c5..dule.js gzip	751 B	751 B	✓
Overall change	52.9 kB	52.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
_app-9a0b9e1..b37e.js gzip	1.28 kB	1.28 kB	✓
_error-ed1b0..8fbd.js gzip	3.44 kB	3.44 kB	✓
hooks-89731c..c609.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-409b283..e3ab.js gzip	1.32 kB	1.32 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	7.73 kB	7.73 kB	✓

Client Pages Modern

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
_app-75d3a82..dule.js gzip	625 B	625 B	✓
_error-4469a..dule.js gzip	2.29 kB	2.29 kB	✓
hooks-cbf13f..dule.js gzip	387 B	387 B	✓
index-b9a643..dule.js gzip	226 B	226 B	✓
link-92d3016..dule.js gzip	1.28 kB	1.28 kB	✓
routerDirect..dule.js gzip	284 B	284 B	✓
withRouter-f..dule.js gzip	282 B	282 B	✓
Overall change	5.37 kB	5.37 kB	✓

Client Build Manifests

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
_buildManifest.js gzip	323 B	323 B	✓
_buildManife..dule.js gzip	329 B	329 B	✓
Overall change	652 B	652 B	✓

Serverless bundles

	vercel/next.js canary	kmkzt/next.js fix-expo-link	Change
_error.js	1.06 MB	1.06 MB	✓
404.html	4.34 kB	4.34 kB	✓
hooks.html	3.92 kB	3.92 kB	✓
index.js	1.06 MB	1.06 MB	✓
link.js	1.1 MB	1.1 MB	✓
routerDirect.js	1.1 MB	1.1 MB	✓
withRouter.js	1.1 MB	1.1 MB	✓
Overall change	5.41 MB	5.41 MB	✓

Commit: 14266d1