Update 10-testing.mdx

[uzairali001]

Fixed next/jest.js import in documentation. without .js it show this error

Error [ERR_MODULE_NOT_FOUND]: Cannot find module 'F:\React\my-project\node_modules\next\jest' imported from F:\React\my-project\jest.config.mjs
Did you mean to import next/jest.js?
    at new NodeError (node:internal/errors:399:5)
    at finalizeResolution (node:internal/modules/esm/resolve:326:11)
    at moduleResolve (node:internal/modules/esm/resolve:945:10)
    at defaultResolve (node:internal/modules/esm/resolve:1153:11)
    at nextResolve (node:internal/modules/esm/loader:163:28)
    at ESMLoader.resolve (node:internal/modules/esm/loader:838:30)
    at ESMLoader.getModuleJob (node:internal/modules/esm/loader:424:18)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:77:40)
    at link (node:internal/modules/esm/module_job:76:36)

[leerob]

This should not be needed. I was not able to reproduce. Could you please open an issue with a minimal reproduction?

[uzairali001]

I've opened the issue #54491 and provided the repo which reproduces this issue.

[balazsorban44]

I think this is valid @leerob, I'm able to reproduce it.

#42144 intended to update it this way, but #53100 reverted the change in this PR by accident.

This would be required as noted by @uzairali001 currently, since we are missing the exports field from next.

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