Add upgrade instructions and considerations for Consul 1.13.1

website/content/docs/upgrading/instructions/index.mdx

@@ -28,6 +28,9 @@ The upgrade guides will mention notable changes and link to relevant changelogs
 we recommend reviewing the changelog for versions between the one you are on and the
 one you are upgrading to at each step to familiarize yourself with changes.
 
+~> **Note:** If you are upgrading from `1.11`+ and have connect proxies 
+registered, upgrade directly to `1.13.1` instead of `1.13.0`.
+
 Select your _currently installed_ release series:
 - [1.9.x](/docs/upgrading/instructions/upgrade-to-1-10-x)
 - [1.8.x](/docs/upgrading/instructions/upgrade-to-1-10-x)

website/content/docs/upgrading/upgrade-specific.mdx

@@ -14,7 +14,10 @@ provided for their upgrades as a result of new features or changed behavior.
 This page is used to document those details separately from the standard
 upgrade flow.
 
-## Consul 1.13.0
+## Consul 1.13.x
+
+~> **Note:** If you are upgrading from `1.11`+ and have connect proxies 
+registered, upgrade directly to `1.13.1` instead of `1.13.0`.
 
 ### gRPC TLS