Backport of docs: Consul at Scale corrections into release/1.14.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #16086 to be assessed for backporting due to the inclusion of the label type/docs-cherrypick.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

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

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Description

After merging the PR that created the Consul at scale guide, I noticed a typo in the first sentence. I gave the page another editorial pass, making some additional fixes along the way.

PR Checklist

• [ ] updated test coverage
• [X] external facing docs updated
• [X] not a security concern

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Overview of commits

• 59cc270f704491382af3ea3616b294784273ce29

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• [x] boruszak
• [ ] temp

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