docs: fix endpoint filename, types

[hyunbinseo]

Current documentation mixes +server.js and +page.server.js descriptions.

I have unified it to the former. Maybe latter is more desirable?

// src/routes/[foo]/[bar]/[baz]/+page.server.ts (or js)

// Invalid export 'GET'
export const GET = () => {};

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-13483-svelte.vercel.app/

[dummdidumm]

Thank you! There's one more file misname just below your edits - could you check that aswell?

[hyunbinseo]

I've removed RouteId so that it matches the PageLoad documentation:

export type PageLoad = Kit.Load<RouteParams, PageServerData, PageParentData, OutputData, RouteId>; // actual: too long
export type PageLoad = Kit.Load<RouteParams>; // existing: kept as-is

[eltigerchino]

Thank you!