First step in the Vim 7.3 branch.  Changed version numbers.
diff --git a/runtime/doc/undo.txt b/runtime/doc/undo.txt
index 0659948..2c8c60c 100644
--- a/runtime/doc/undo.txt
+++ b/runtime/doc/undo.txt
@@ -1,4 +1,4 @@
-*undo.txt*      For Vim version 7.2.  Last change: 2009 Apr 12
+*undo.txt*      For Vim version 7.3a.  Last change: 2009 Apr 12
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar