First step in the Vim 7.3 branch.  Changed version numbers.
diff --git a/runtime/doc/develop.txt b/runtime/doc/develop.txt
index dd8031c..78b59f0 100644
--- a/runtime/doc/develop.txt
+++ b/runtime/doc/develop.txt
@@ -1,4 +1,4 @@
-*develop.txt*   For Vim version 7.2.  Last change: 2008 Dec 17
+*develop.txt*   For Vim version 7.3a.  Last change: 2008 Dec 17
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar