updated for version 7.3.423
Problem:    Small mistakes in comments, proto and indent.
Solution:   Fix the mistakes.

Also update runtime files
diff --git a/src/ex_cmds2.c b/src/ex_cmds2.c
index 7d1e282e..4b2564b 100644
--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -1939,7 +1939,7 @@
 }
 
 /*
- * Return TRUE if window "win" is editing then file at the current argument
+ * Return TRUE if window "win" is editing the file at the current argument
  * index.
  */
     static int