[master] Added ChangeLog entry for 3636.

Also fixed whitespaces in some recent entries.

ChangeLog

+875.    [bug]           afidalgo, marcin
+	The DHCPv4 server no longer appends the trailing dot to the
+	hostnames sent to the clients in the Hostname option (12).
+	Appending trailing dot confused some DHCPv4 clients.
+	Credits to Alexis Fidalgo for submitting a patch.
+	(Trac #3636, git 450867e6987f4c786ad6c2cc95cabcff601c1b48)
+
 874.    [func]           marcin
 	Changes to the Memfile lease database backend to load
 	leases from multiple files during startup or server