Update snmp_sysdescr.xml

changed certainty to 0.85

xml/snmp_sysdescr.xml

@@ -1961,7 +1961,7 @@ Copyright (c) 1995-2005 by Cisco Systems
     <description>Cisco Firepower Threat Defense</description>
     <example os.version="10.2.3.1">Cisco Firepower Threat Defense, Version 10.2.3.1 (Build 43), ASA Version 9.9(2)4</example>
     <example os.version="7.0.0">Cisco Firepower Threat Defense, Version 7.0.0 (Build 3), ASA Version 9.16(0)3</example>
-    <param pos="0" name="os.certainty" value="0.7"/>
+    <param pos="0" name="os.certainty" value="0.85"/>
     <param pos="0" name="os.vendor" value="Cisco"/>
     <param pos="0" name="os.product" value="Firepower Threat Defense"/>
     <param pos="0" name="os.family" value="Secure Firewall"/>