change to 4.19.3 stable

Author: SNiemann15

virt/release_notes/virt-4-19-release-notes.adoc

@@ -318,8 +318,8 @@ You can also disable free page reporting of memory ballooning for all new VMs. T
 
 Release notes for asynchronous releases of Red Hat {VirtProductName}.
 
-[id="virt-4.19.4_{context}"]
-=== 4.19.4
+[id="virt-4.19.3_{context}"]
+=== 4.19.3
 
 .New and changed features