docs: fix duration known type

[fad3t]

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Aligns the name of the duration known type (meta/v1/Duration) with what's actually in the code.

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[nitishfy]

can you please share the sources that made you propose these changes?

[reggie-k]

Approved by mistake, waiting for the answer to Nitish's question.

[fad3t]

can you please share the sources that made you propose these changes?

Yes, sorry here it is: https://github.com/argoproj/argo-cd/blob/master/util/argo/normalizers/knowntypes_normalizer.go#L36

Using meta/v1/duration as suggested in the doc throws the following warning message:

Failed to configure known field normalizer: type 'meta/v1/duration' is not supported