📖 OIDC identity provider description matches field name

[joshfrench]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Aligns AWSManagedControlPlaneSpec.OIDCIdentityProviderConfig name and description

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
🚫

Special notes for your reviewer:
I pulled this out of #5108 as unrelated (see #5578)

Checklist:

• squashed commits
• includes documentation
• includes emoji in title
• adds unit tests
• adds or updates e2e tests

Release note:

Fix `AWSManagedControlPlaneSpec.OIDCIdentityProvider` field documentation

[k8s-ci-robot]

Hi @joshfrench. Thanks for your PR.

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[AndiDog]

/ok-to-test

[Ankitasw]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Details

Git tree hash: dfb13aee07ca8787bd4e6c5da21c495038979603

[k8s-ci-robot]

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[Ankitasw]

/retest

[AndiDog]

Please run make generate to fix the error.

[Ankitasw]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Details

Git tree hash: 86c1caf423468363992a533118fc26661759cd6b