doc: Add note on enterprise version support (#1311)

doc/content/the-things-stack/host/_index.md

@@ -15,6 +15,7 @@ Users can easily get started with The Things Stack Cloud by signing up for [free
 For users with operational experience and for users who require that the LoRaWAN data is within their own infrastructural domain, {{% tts %}} is packaged in various flavours for users to install on their own hardware/cloud.
 
 {{% tts %}} is available for production installations for the following cases
+
 - [Amazon Cloud Services templates]({{< relref "aws" >}})
 - [Kubernetes templates]({{< relref "kubernetes" >}})
 
@@ -23,3 +24,8 @@ For users who want to install {{% tts %}} on their local machines for testing or
 ## Special Deployments
 
 [The Things Join Server]({{< relref "join-server" >}}) is a stand-alone LoRaWAN Join Server. The Things Join Server can be used by device makers to provision end devices to be used by all distributions of The Things Stack as well as any other standards compliant LoRaWAN Network Servers.
+
+## Version Update Support
+
+With {{% tts %}} Enterprise deployments, users can update {{% tts %}} versions at their convenience.
+However, The Things Industries will support the _two most recent minor releases_ of the v3 major version with security fixes. For example, if the latest {{% tts %}} version is `v3.30.0`, critical security updates will be provided only for versions `v3.29.0` and `v3.28.0`. We recommend maintaining your deployment as close to the latest version as possible to ensure optimal security and performance.