doc: remove reference to "credentials object"

[sam-github]

The reference is confusing because the object is actually of class
SecureContext. There is no object with class "credentials".

See: #20432 (comment)

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

[nodejs-github-bot]

@sam-github build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/3038/pipeline

[sam-github]

ci: https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/3039/

[sam-github]

ci: https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/3040/

[Trott]

Total micro-nit that you can ignore if you disagree, but I think the two sentences are clearer if you divide them up this way instead:

The `tls.createSecureContext()` method creates a `SecureContext` object with
no public methods. It is usable as an argument to several `tls` APIs such as
[`tls.createServer()`][] and [`server.addContext()`][].

[sam-github]

I see your point, how about ba029f5?

[sam-github]

ci: https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/3058/

[sam-github]

Landed in f11f180

[cinderblock]

@sam-github Why does SecureContext not have any public methods?

Specifically, secureContext.context.addCACert(...) seems to be available and quite helpful. See #20432 (comment) and #20432 (comment) for more details.

[sam-github]

@cinderblock I can't speak to the history, but I can say if there is a specific feature you would like, please post a feature request. It will help to have some concrete use cases. There are lots of things we could just make public, but it takes short term effort to add tests and docs (though feature requests with an acompanying PR don't have to attract a volunteer), and long-term, it can make it harder to improve the node API if too much of our internals are exposed in the API.