Added missing parameter in auth set up

[jmagak]

Adds the prompt: auto config which is not set in the current RHDH docs for RHBK auth provider set up here.

IMPORTANT: Do Not Merge - To be merged by Docs Team Only

Version(s): 1.4

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Issue: https://issues.redhat.com/browse/RHIDP-5681

[rhdh-bot]

Updated preview: https://redhat-developer.github.io/red-hat-developers-documentation-rhdh/pr-898/ @ 02/04/25 19:39:07

[JessicaJHee]

Thank you for this! I have a few small comments.

It would also be nice to add a description here explaining this config:

Something like:
prompt: auto: To allow the identity provider to automatically determine whether to prompt for credentials or skip the login redirect if you have an active SSO session.

Some more useful information to consider including:

Without setting this value, the provider will default to prompt: none, which assumes that you are already logged on in the IDP and will reject the sign-in request without an active session.

prompt: login: will force the identity provider to always require credentials from the user.

[JessicaJHee]

I've added a few more comments, thank you!