Backport of Add docs for usage endpoint and command into release/1.15.x#16383

hc-github-team-consul-core merged 2 commits intorelease/1.15.xhashicorp/consul:release/1.15.xfrom

backport/operator-usage-docs/firmly-integral-arachnidhashicorp/consul:backport/operator-usage-docs/firmly-integral-arachnidCopy head branch name to clipboard