oas generate call requires undocumented base filePath

[Brian Mickel]

After running

$ npx oas init
This will help you set up an OpenAPI 3.0 Spec (formerly Swagger) in your
repo, so you can start documenting your API!

? Name of the API ExampleName
? Version number 1.0.0
? License ISC
? Full Base URL https://api.example.com/
? Output JSON or YAML file example-api-1.0.0.json

Then npx oas generate
I get the error:

Error: No base specification provided!

Finding this "How to provide the base parameter for oas generate?" #229, explains the call to oas requires an argument like npx oas generate './example-api-1.0.0.json'

It would be nice if this was included in both https://openap.is/ and https://github.com/readmeio/oas README
If this is not the correct way to call oas generate, then maybe a troubleshooting section could be added

[Jon Ursenbach]

This has been added in v12.