Backport of Fixes docs of Consul Debug - Adds info about Since Flag into release/1.15.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #19056 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
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@absolutelightning
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: unable to process merge commit: "82108e255116c7ec235bd269026b85162f195989", automatic backport requires rebase workflow

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

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Fixes consul docs to properly document since flag.

Test - https://consul-git-fix-docs-hashicorp.vercel.app/consul/commands/debug

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Overview of commits

• 63a5831 - 82108e2 - a59383c

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

Auto approved Consul Bot automated PR

[hc-github-team-consul-core]

🤔 This PR has changes in the website/ directory but does not have a type/docs-cherrypick label. If the changes are for the next version, this can be ignored. If they are updates to current docs, attach the label to auto cherrypick to the stable-website branch after merging.