Update agent banner text (#791)

Update agent banner note

Author: nginx-seanmoloney

_banners/agent-v3-release.md

@@ -1,7 +1,7 @@
 {{< banner "notice" "NGINX Agent 3.0 is now available" >}}
 
 
-F5 NGINX One Console and NGINX Instance Manager (NIM) do not currently support Agent 3.x. If you are using NGINX One Console or NGINX Instance Manager in your environment, upgrade to the latest Agent 2.x version by following the [Upgrade NGINX Agent](/nginx-agent/installation-upgrade/upgrade/) guide.
+F5 NGINX Instance Manager (NIM) does not currently support Agent 3.x. NGINX Instance Manager customers can upgrade to the latest Agent 2.x version by following the [Upgrade NGINX Agent](/nginx-agent/installation-upgrade/upgrade/) guide.
 
 Please see the [Technical specifications](/nginx-agent/technical-specifications/) for product compatibility.