Backport of Add note about service upstream env var dot broken into release/1.16.x#19398

im2nguyen merged 1 commit intorelease/1.16.xhashicorp/consul:release/1.16.xfrom

backport/docs/note-about-connect-service-upstream-env-var/hardly-verified-muskrathashicorp/consul:backport/docs/note-about-connect-service-upstream-env-var/hardly-verified-muskratCopy head branch name to clipboard