change BIND 10 reference to Kea

doc/guide/logging.xml

@@ -495,7 +495,7 @@ file be created.</para>
           <term>[kea-dhcp4.dhcpsrv/27456]</term>
           <listitem><para>
             The source of the message.  This comprises two components:
-            the BIND 10 process generating the message (in this
+            the Kea process generating the message (in this
             case, <command>kea-dhcp4</command>) and the module
             within the program from which the message originated
             (which is the name of the common library used by DHCP server