Clarify data fetching documentation on calling API routes.

[leerob]

We've received some feedback that the current note about calling API routes inside gSP/gSSP is confusing. This updates the wording to make it clear you can still use fetch in your application, and also to not say you "import" an API route. You import the logic inside the route.

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
buildDuration	8.7s	8.7s	-67ms
nodeModulesSize	82.3 MB	82.3 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
/ failed reqs	0	0	✓
/ total time (seconds)	1.725	1.753	⚠️ +0.03
/ avg req/sec	1449.3	1425.85	⚠️ -23.45
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.064	1.094	⚠️ +0.03
/error-in-render avg req/sec	2349.51	2285.63	⚠️ -63.88

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
677f882d2ed8..8b6e.js gzip	12.8 kB	12.8 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-3c9ff84..1d7c.js gzip	6.56 kB	6.56 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	59 kB	59 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
_app-7231d4b..5856.js gzip	1.28 kB	1.28 kB	✓
_error-fca3d..2eb1.js gzip	3.44 kB	3.44 kB	✓
hooks-d4591d..e7c2.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-db223d9..dbd7.js gzip	1.61 kB	1.61 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	8.01 kB	8.01 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
_buildManifest.js gzip	321 B	321 B	✓
Overall change	321 B	321 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
index.html gzip	614 B	614 B	✓
link.html gzip	620 B	620 B	✓
withRouter.html gzip	608 B	608 B	✓
Overall change	1.84 kB	1.84 kB	✓

---

Serverless Mode

General

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
buildDuration	10.1s	10.1s	⚠️ +15ms
nodeModulesSize	82.3 MB	82.3 MB	✓

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
677f882d2ed8..8b6e.js gzip	12.8 kB	12.8 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-3c9ff84..1d7c.js gzip	6.56 kB	6.56 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	59 kB	59 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
_app-7231d4b..5856.js gzip	1.28 kB	1.28 kB	✓
_error-fca3d..2eb1.js gzip	3.44 kB	3.44 kB	✓
hooks-d4591d..e7c2.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-db223d9..dbd7.js gzip	1.61 kB	1.61 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
Overall change	8.01 kB	8.01 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
_buildManifest.js gzip	321 B	321 B	✓
Overall change	321 B	321 B	✓

Serverless bundles

	vercel/next.js canary	vercel/next.js leerob-patch-1	Change
_error.js	997 kB	997 kB	✓
404.html	2.67 kB	2.67 kB	✓
hooks.html	1.92 kB	1.92 kB	✓
index.js	998 kB	998 kB	✓
link.js	1.05 MB	1.05 MB	✓
routerDirect.js	1.04 MB	1.04 MB	✓
withRouter.js	1.04 MB	1.04 MB	✓
Overall change	5.14 MB	5.14 MB	✓

Commit: 9d53c42

[tmerlet]

strangely I'm still seeing the old text?
"Note: You should not use fetch() to call an API route in your application. Instead, directly import the API route and call its function yourself. You may need to slightly refactor your code for this approach."
https://nextjs.org/docs/basic-features/data-fetching#getstaticprops-static-generation