(DOCSP-17750): remove no 4.4 app db 1.12+

Author: jwilliams-mongo

source/reference/known-issues.txt

@@ -10,14 +10,6 @@ Known Issues in the |k8s-op-full|
    :depth: 1
    :class: singlecol
 
-.. _meko-no-4dot4-appdb:
-
-Unable to Use MongoDB 4.4 for an |onprem| Application Database
----------------------------------------------------------------
-
-You can't use MongoDB 4.4 as an application database for an |onprem|
-resource. Use an earlier MongoDB version instead.
-
 .. _k8s-private-cluster-on-gke:
 
 Update Google Firewall Rules to Fix WebHook Issues