Fix identity provider section.

[rkratky]

What does this PR do?

• Uses attributes consistently for identity provider.
• Fixes some language and formatting.

Specify the version of the product this PR applies to.

7.18+

PR Checklist

As the author of this Pull Request I made sure that:

• [ x ] vale has been run successfully against the PR branch
• [ x ] Link checker has been run successfully against the PR branch
• [ x ] Documentation describes a scenario that is already covered by QE tests, otherwise an issue has been created and acknowledged by Che QE team
• [ x ] Changed article references are updated where they are used (or a redirect has been set up on the docs side):
  • [ x ] Dashboard branding.constant.ts + product.json
  • [ x ] Chectl constants.ts

[yhontyk]

How will this get reflected in the downstream? Those are two distinct attributes there.

[rkratky]

I have an MR for downstream that fixes it.