Document which PodSpec fields are valid

[duglin]

Describe the change you'd like to see
While the yaml for a KnService leverages the Kubernetes PodSpec definition, not all of the PodSpec fields are valid for KnServices. We should document which fields people can use.

[duglin]

Perhaps just a pointer to https://github.com/knative/docs/blob/master/docs/serving/spec/knative-api-specification-1.0.md#container since I didn't see how to get to this doc from our md files.
Seem like https://knative.dev/docs/reference/serving-api/#serving.knative.dev/v1beta1.Revision might be a duplicate, which is unfortunate since that might mean they get out of sync.

[arghya88]

is initcontainers allowed?

[duglin]

@arghya88 no I do not think they are supported yet

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/lifecycle stale

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/lifecycle rotten

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