Backport of docs: Add Client Agent commands to CLI docs into release/0.19.x

[hc-github-team-secure-boundary]

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Backport

This PR is auto-generated from #5826 to be assessed for backporting due to the inclusion of the label backport/website.

:rotating_light:

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: @Dan-Heath 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/boundary/merges: 409 Merge conflict []

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

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We forgot to update the CLI docs with the Client Agent commands when it went to GA. This PR adds them.

View the update in the preview deployment:

• Overview
• pause
• resume
• sessions
• status

I also reordered some of the existing commands into alphabetical order on the nav pane since they were incorrectly listed.

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Overview of commits

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