Helm chart: fix documented valid options for logLevel

[plumdog]

Description

Found that setting logLevel: warn did not work as the chart's README suggested and gave me an error.

$ docker run --rm k8s.gcr.io/external-dns/external-dns:v0.10.2 --log-level=warn       
time="2022-02-24T13:38:24Z" level=fatal msg="flag parsing error: enum value must be one of panic,fatal,error,warning,info,debug,trace, got 'warn'"

(I have not added trace, even though it looks like that might be a valid option)

Found:

$ 2>&1 docker run --rm k8s.gcr.io/external-dns/external-dns:v0.10.2 --help | grep -A 2 log-level
  --log-level=info               Set the level of logging. (default: info,
                                 options: panic, debug, info, warning, error,
                                 fatal

and
https://github.com/kubernetes-sigs/external-dns/blob/v0.10.2/pkg/apis/externaldns/types.go#L506

So looks like the correct value is warning not warn, so I've changed the chart's README to say that.

I could not find an existing issue for this. I have not created one, let me know if I should.

Checklist

• Unit tests updated (n/a)
• End user documentation updated

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[stevehipwell]

Thanks for the PR @plumdog.

@Raffo could you approve the workflow and do the LGTM.

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: plumdog, stevehipwell

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[Raffo]

/lgtm