Enhanced excludedBy description on zext.h

Signed-off-by: Afonso Oliveira <[email protected]>

Author: AFOliveira

arch/inst/B/zext.h.yaml

@@ -28,7 +28,8 @@ zext.h:
         location: 19-15
       - name: rd
         location: 11-7
-  excludedBy: Zbkb  # zext.h instruction is a pseudo-op for `packw` when `Zbkb` is implemented 
+  excludedBy: 
+    anyOf: [Zk, Zkn, Zks, Zbkb]  # zext.h instruction is a pseudo-op for `packw` when `Zbkb` is implemented 
   assembly: xd, xs1
   access:
     s: always