docs: verify/fix documentation related to Connect+ACLs to assume ACLv2 syntax

A lot of the documentation about using Consul Connect with ACLs was written pre-1.4, and as such tends to rely upon ACL v1 assumptions like granting `service:write` on `web` implicitly allowed `service:write` on `web-sidecar-proxy` etc.

If you attempt to follow the documentation to setup Connect with ACLs post-1.4 some of these guides are misleading because by default these grants are now exact matches rather than prefix matches. You need to grant `service:write` on `web` AND on `web-sidecar-proxy` for example.

Lint all of the documentation and update for an ACL v2 set of defaults.