Backport of docs: minor fixes to JWT auth docs into release/1.16.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #17680 to be assessed for backporting due to the inclusion of the label backport/1.16.

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The person who merged in the original PR is:
@boruszak
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

A few minor formatting fixes were requested after the JWT Auth docs were merged. This PR makes those changes the configuration entry formatting reference pages.

PR Checklist

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

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Overview of commits

• e3c5135 - 7ae6e2a

[hashicorp-cla]

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• boruszak
• temp

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

Auto approved Consul Bot automated PR