Update Palo Alto Networks Firewall not tested recently (#654)

source/releasenotes/compat.rst

diff --git a/source/releasenotes/compat.rst b/source/releasenotes/compat.rst
index f40f6c0..f72cff0 100644
--- a/source/releasenotes/compat.rst
+++ b/source/releasenotes/compat.rst
@@ -88,6 +88,7 @@
 -  SRX (Model srx100b) versions 10.3 to 10.4 R7.5 (not tested to work fine for last many CloudStack releases)
 -  F5 11.X (not tested to work fine for last many CloudStack releases)
 -  Force 10 Switch version S4810 for Baremetal Advanced Networks (not tested to work fine for last many CloudStack releases)
+-  Palo Alto Networks Firewall (not tested to work fine in the last recent CloudStack releases)
 
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