Backport of docs: update the defaults for request limits into release/1.15.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #17437 to be assessed for backporting due to the inclusion of the label backport/1.15.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
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The person who merged in the original PR is:
@jmurret
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/consul/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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Description

Changing the documentation for the default values for read_rate and write_rate in request_limits to reflect what is in code.

Testing & Reproduction steps

Links

PR Checklist

• updated test coverage
• external facing docs updated
• appropriate backport labels added
• not a security concern

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Overview of commits

• 2a50fe1 - 9e37a9c - 6c66c45 - 999a221 - 9804684

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1 out of 2 committers have signed the CLA.

• jmurret
• temp

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[github-team-consul-core-pr-approver]

Auto approved Consul Bot automated PR

[david-yu]

Looks like this backport failed a cherrypick.