Fix default CoreDNS TTL

[simonhammes]

Description

The default TTL is 30 seconds. I fixed the explanation to match the Corefile snippet above the text.

Ref: kubernetes/kubernetes@f7f51fa

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[sftim]

Thanks, but the default CoreDNS TTL is not 30 seconds. In other words, CoreDNS has a different default value for this field (I think it's 5 seconds).

Try this:

Suggested change

	- `ttl` allows you to set a custom TTL for responses. The default is 30 seconds.
	- `ttl` allows you to set a maximum time to live (TTL) for responses. The example above
	configures CoreDNS to cache records for up to 30 seconds, even if it receives a
	record with a longer TTL.

[simonhammes]

Thanks, but the default CoreDNS TTL is not 30 seconds.

I know; sorry for shortening the PR title too much. I meant default TTL when deployed through kubeadm (ref: https://github.com/search?q=repo%3Akubernetes%2Fkubernetes%20%2Fttl%20%5B%5Cd%5D%2F&type=code)

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But then I completely misunderstood the current wording. My bad.

I was trying to figure out the default TTL inside a K8S cluster and thought the snippet and the text got out of sync.

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How about The default configuration above [...]?