Improve docs for fargate networking to avoid confusion

[SgtCoDFish]

Fixes #696

/kind documentation

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[jakexks]

Looks good. Would it be worth adding this report: https://kubernetes.slack.com/archives/C4NV3DWUC/p1631004960113100?thread_ts=1630950059.102500&cid=C4NV3DWUC to the docs too? (stating that runAsUser: 1001 was required on fargate)

[SgtCoDFish]

Looks good. Would it be worth adding this report: https://kubernetes.slack.com/archives/C4NV3DWUC/p1631004960113100?thread_ts=1630950059.102500&cid=C4NV3DWUC to the docs too? (stating that runAsUser: 1001 was required on fargate)

I don't think I'm fully convinced that the reported issue relating to STS/IAM and runAsUser are related, there. I don't see why runAsUser would have anything to do with that error 🤔

I think pending further evidence that runAsUser is required I'd rather leave that advice out, or I'd worry it could become a cargo cult thing.

[SgtCoDFish]

@jakexks friendly prod:

Looks good. Would it be worth adding this report: https://kubernetes.slack.com/archives/C4NV3DWUC/p1631004960113100?thread_ts=1630950059.102500&cid=C4NV3DWUC to the docs too? (stating that runAsUser: 1001 was required on fargate)

do you think this is is required for this PR or can we get it merged as-is?

[jakexks]

/lgtm