Fix typo: "two commands" -> "three commands"
    
        | author | Richard Cheng <rcheng@neuratron.com> | 
    
        | date | Mon, 16 Apr 2012 14:41:50 +0100 | 
    
    
        | parents | a8dd2fa6d24c | 
    
        | children | 751620ce9fae | 
    
        | branches/tags | (none) | 
    
        | files | chapters/21.markdown | 
Changes
    
--- a/chapters/21.markdown	Mon Apr 16 14:38:23 2012 +0100
+++ b/chapters/21.markdown	Mon Apr 16 14:41:50 2012 +0100
@@ -73,7 +73,7 @@
 
 This time Vim *does* display the text!  What's going on here?
 
-To try to wrap our heads around what's going on, run the following two commands:
+To try to wrap our heads around what's going on, run the following three commands:
 
     :::vim
     :echom "hello" + 10