[master] remove "update" from confusing changelog entry 672

It previously looked like a command name.
suggested via jabber

ChangeLog

@@ -608,12 +608,11 @@ bind10-1.2.0beta1 released on March 6, 2014
 	(Trac #3145, git 3a844e85ecc3067ccd1c01841f4a61366cb278f4)
 
 672.	[func]		tmark
-	Added b10-dhcp-ddnsupdate transaction base class,
-	NameChangeTransaction.  This class provides the common
-	structure and methods to implement the state models described
-	in the DHCP_DDNS design, plus integration with DNSClient
-	and its callback mechanism for asynchronous IO with the
-	DNS servers.
+	Added b10-dhcp-ddns transaction base class, NameChangeTransaction.
+	This class provides the common structure and methods to implement
+	the state models described in the DHCP_DDNS design, plus
+	integration with DNSClient and its callback mechanism for
+	asynchronous IO with the DNS servers.
 	(Trac #3086, git 079b862c9eb21056fdf957e560b8fe7b218441b6)
 
 671.	[func]		dclink, tomek