First step in the Vim 7.3 branch.  Changed version numbers.
diff --git a/runtime/doc/os_os2.txt b/runtime/doc/os_os2.txt
index b1116a4..13fe793 100644
--- a/runtime/doc/os_os2.txt
+++ b/runtime/doc/os_os2.txt
@@ -1,4 +1,4 @@
-*os_os2.txt*    For Vim version 7.2.  Last change: 2007 Apr 22
+*os_os2.txt*    For Vim version 7.3a.  Last change: 2007 Apr 22
 
 
 		  VIM REFERENCE MANUAL    by Paul Slootman