doc: harmonize description of `ca` argument
Different sections said different things about what the ca argument
should look like. This commit harmonizes them.
Ref: https://github.com/nodejs/node/pull/4099
R=@rvagg
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Different sections said different things about what the ca argument
should look like. This commit harmonizes them.
Ref: https://github.com/nodejs/node/pull/4099
R=@rvagg