Backport of Major updates and reorganizing of checks.mdx into release/1.14.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #15806 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.

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

• Removing Duplication at the top of the document
• Correcting links to go from less detailed section to more detailed section
• Removing misplaced Headlines

PR Checklist

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

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Overview of commits

• cdd4ab048ce0ebfca4ed31631a7f1bd91628e49a - c8d205f52d40fc77ec7743b339806888a1c2fb3c - 7937a4dea1117484888edea06396f7bbdc83c11b - 5ecab6230d7cee877a43b9f811122e345ec02682 - 65423ea703ee5221277d9e234bd23031dc4fd956 - 73674fa830c24d587c7796464ccc363a7f07bc49 - 9f2f77f3c2821ce8f0bba55a77648250ec289201 - e5e0d31034317e859098223f4fe0ce06855cf1cc - a41667374923ab517ec44b1e2e8164d29d284d2d - 4ec4d9e107e3725b98f449188b5192a71ab92c47 - 9ecfd56f37571af6ae929fb420f231cbcbe80d9f - 2ced469adc2fe4201d1e5fcf80f86f5ee165e7d1 - 29fb1bd97fc8d46dbd451c0f2847297dd779b23e - c52cdf61c56b73bc5036c3110c08005516457724 - 781930b36ffb5812561657a2e42b0dd66ad917aa - f3a328a2336a48407285d2b26868fbe36830cfb2 - 66b25f742932aa1eb7abfb9bc28e78d9f89d0e29

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