Update documentation for External Secrets Operator

[rarguello]

Update documentation for External Secrets Operator: corrected object names and updated installation instructions to reflect changes from externalSecrets to externalSecretsConfig, and modified the update channel from tech-preview-v0.1 to stable-v1.

Version(s):
4.20

[openshift-ci]

Hi @rarguello. Thanks for your PR.

I'm waiting for a openshift 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[openshift-merge-robot]

PR needs rebase.

Details

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.