Create the Release Notes for the Service Mesh 2.0 release

https://bugzilla.redhat.com/show_bug.cgi?id=1874410 -[CLOSED NOTABUG] Disconnected installation may be broken for next release.

From e-mail 10/14/20 (BAvery)Upstream issue for Known Issues https://github.com/istio/istio/issues/24619  Connections to external HTTP services configured with SIMPLE_TLS destination rules are aborted by the external server or envoy due to non-negotiated alpn errors.