Document the type and disposition options of StreamableFile

[iliazeus]

I'm submitting a...

• Regression
• Bug report
• Feature request
• Documentation issue or request (new chapter/page)
• Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

Right now, only the res.set() way of setting the content-type of a StreamableFile is documented (here).

Expected behavior

Document the type (and, ideally, disposition) properties of StreamableFileOptions. Maybe even remove the res.set() example, leaving only the purely StreamableFile-based way

Minimal reproduction of the problem with instructions

N/A

What is the motivation / use case for changing the behavior?

Using the response object with a StreamableFile return is a potential bug source (too easy to forget the passthrough: true). Using the response object seems un-Nest-like when there's a way to do it using the returned object.

Environment

N/A