Fix documentation related to setInputFiles function

[JunNishimura]

What?

grafana/k6#4655

Regarding the issues discussed above, I have made corrections to the type definitions in the following pull request.

grafana/k6-DefinitelyTyped#115

Accordingly, the documentation was revised.

• change file.buffer type from ArrayBuffer to string
• correct mimeType property name of Page in examples
• correct examples where a selector is not passed to the setInputFiles function

Checklist

• I have used a meaningful title for the PR.
• I have described the changes I've made in the "What?" section above.
• I have performed a self-review of my changes.
• I have run the npm start command locally and verified that the changes look good.

• I have made my changes in the docs/sources/k6/next folder of the documentation.
• I have reflected my changes in the docs/sources/k6/v{most_recent_release} folder of the documentation.
• I have reflected my changes in the relevant folders of the two previous k6 versions of the documentation (if still applicable to previous versions).

• I have made my changes in the docs/sources/k6/next folder of the documentation.

Related PR(s)/Issue(s)

grafana/k6#4655
grafana/k6-DefinitelyTyped#115

[cla-assistant]

All committers have signed the CLA.

[codebien]

Hey @JunNishimura, can you sign the CLA, please? This is a requires step to merge this pull request.

[JunNishimura]

@codebien

Hi, I signed the CLA. I would appreciate it if you review again. Thanks!

[oleiade]

LGTM — documentation fix.

[oleiade]

I'm confused why the code examples are failing when they were not before? Any idea @heitortsergent ?

[heitortsergent]

@oleiade I'm confused as well... I don't see any regressions, besides removing the {{ code }} blocks. But also, reading the code snippet, it does look like it should fail since it's trying to read a local file, and we probably need to add a <!-- md-k6:skip --> there. Wdyt? 🤔