doc: update ElasticQuota's max value

[Gekko0114]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Updated the explanation of ElasticQuota's max value.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Thank you for reviewing this PR.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[ffromani]

/ok-to-test

Hi! Thanks for your contribution!
I for myself do believe that clarifying that "infinite" actually means "maxint" is a useful and welcome addition, but I'd just link back to the golang spec rather than inline the actual value in our docs. Let's see what other reviewers think though.

[Gekko0114]

Thanks for your comment !

but I'd just link back to the golang spec

Do you mean that I should simply paste the link like this spec?
https://cs.opensource.google/go/go/+/master:src/runtime/string.go;l=354?q=maxint64&ss=go%2Fgo
If I have misunderstood, please let me know!

[Huang-Wei]

/ok-to-test

[ffromani]

/lgtm
/approve

thanks for your contribution!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ffromani, Gekko0114

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