[master] Added ChangeLog entry for #3784.

ChangeLog

@@ -1,6 +1,11 @@
+924.	[bug]		marcin
+	Removed shell warning about the "missing format character"
+	in the keactrl usage.
+	(Trac #3784, git aa683395a4cd75af5340eb8603fe46b7b0dd8f4e)
+
 923.	[func]		tmark
 	The DHCPv4 server now logs packets it has either dropped as invalid
-	or to which it has replied with a NAK to a separate logger, 
+	or to which it has replied with a NAK to a separate logger,
 	"kea_dhcp4.bad_packet".
 	(Trac #3743, git cb91ca851099423e1b6c39cca3f3e2ba29795a51)