[master] ChangeLog updated, missed review correction fixed.

ChangeLog

@@ -1,3 +1,7 @@
+1176.	[doc]		tomek
+	Developer's Guide has been updated.
+	(trac #4299, git ed38076c183394feaef60e7123d0c488c9f6447d)
+
 1175.	[bug]		marcin
 	Corrected a bug whereby a client, for which there was no
 	host reservation specified, did not obtain an IPv6 lease

doc/devel/config-backend.dox

@@ -25,7 +25,7 @@ as possible. If you are thinking about developing new ways to
 configure Kea, the recommendation is to write an external piece of
 software that will communicate with Kea using this channel.
 
-@section configBackendHistoric Historic Notes
+@section configBackendHistoric Alternate Configuration Backends
 
 While this section currently has no practical value, it may become useful
 one day to develop a minimalistic, stripped down Kea version that does