[wip] Update the --external-ca flag for swarm update/ca #1182
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As moby/swarmkit#2680 pointed out, the CLI documentation for the
--external-ca
flag indocker swarm update
anddocker swarm ca
is not very clear.This updates the docs and the CLI help to display the form the value should take, and what is required by the external CA server.
Note that this is dependent upon the design review of #1179.
Also, this does not add additional documentation for the
--external-ca
flag fordocker swarm init
, due to moby/moby#33385