docs: Add missing type to import statement (#44111)

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## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the
feature request has been accepted for implementation before opening a
PR.
- [ ] Related issues linked using `fixes #number`
- [ ]
[e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs)
tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Documentation / Examples

- [x] Make sure the linting passes by running `pnpm build && pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing
doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)

Co-authored-by: JJ Kasper <jj@jjsweb.site>

docs/api-reference/data-fetching/get-static-props.md

@@ -233,8 +233,7 @@ export const getStaticProps: GetStaticProps<{ posts: Post[] }> = async (
 If you want to get inferred typings for your props, you can use `InferGetStaticPropsType<typeof getStaticProps>`:
 
 ```tsx
-import { InferGetStaticPropsType } from 'next'
-import { GetStaticProps } from 'next'
+import type { InferGetStaticPropsType, GetStaticProps } from 'next'
 
 type Post = {
   author: string