fix typo in ChangeLog-1.9.3

doc/ChangeLog-1.9.3

@@ -73273,7 +73273,7 @@ Fri Nov 18 17:35:09 2005  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/lib/multi-tk.rb: add restriction to access the entried
 	  command table and manipulate other IPs (for reason of security).
-	  Now, a IP object can be controlled by only its master IP or the
+	  Now, an IP object can be controlled by only its master IP or the
 	  default IP.
 
 	* ext/tk/lib/remote-tk.rb: add restriction to manipulate.
@@ -82931,7 +82931,7 @@ Wed Sep  8 18:44:03 2004  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 Wed Sep  8 15:19:49 2004  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
-	* ext/tcltklib/tcltklib.c (ip_init): cannot create a IP at level 4
+	* ext/tcltklib/tcltklib.c (ip_init): cannot create an IP at level 4
 
 	* ext/tk/lib/multi-tk.rb: improve 'exit' operation, security check,
 	  and error treatment