spelling: documentation

ChangeLog

@@ -1865,7 +1865,7 @@ Kea 0.9.2-beta released on June 30, 2015
 	(Trac #3070, git a6b6156aaa95ab74c69a537e90483f82e9fbe4a2)
 
 946.	[doc]		tmark
-	Added doucmentation for kea-admin "lease-dump" command to the
+	Added documentation for kea-admin "lease-dump" command to the
 	Kea Admininstrator's Guide and kea-admin man page.
 	(Trac #3803, git 54b59b7ef02f6428405794066ea779e9bd4c0b6e)