📖 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.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[AndiDog]

/ok-to-test

[Ankitasw]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: dfb13aee07ca8787bd4e6c5da21c495038979603

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[Ankitasw]

/retest

[k8s-ci-robot]

@joshfrench: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-aws-verify	bb4ca7e	link	true	/test pull-cluster-api-provider-aws-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.