Backport of [NET-4876] docs - update upgrade index page to not recommend consul leave. into release/1.16.x#18110
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Backport
This PR is auto-generated from #18100 to be assessed for backporting due to the inclusion of the label backport/1.16.
The below text is copied from the body of the original PR.
Description
consul leave is bad during upgrades because the leaving server will disconnect and think there is no leader and initiate a series of new elections, but cannot communicate with others. When it comes up, its term is much higher than the leader and the leader will detect this and step down. Having the leader change is bad when you are trying to guarantee that the leader is upgraded last.
We've already changed this on the general upgrade process page. This is another instance we just found
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