Backport of docs: fix agent catalog-services caching method into release/1.13.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #15645 to be assessed for backporting due to the inclusion of the label backport/1.13.

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

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Description

The docs for /catalog/services lists the agent caching type as simple but I think should actually be background refresh.

• cachetype.CatalogListServices

Testing & Reproduction steps

• In the case of bugs, describe how to replicate
• If any manual tests were done, document the steps and the conditions to replicate
• Call out any important/ relevant unit tests, e2e tests or integration tests you have added or are adding

Links

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PR Checklist

• updated test coverage
• external facing docs updated
• not a security concern

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Overview of commits

• fe777fc - 523495d - 906a413

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

Auto approved Consul Bot automated PR