present: fix misspelled TODO

Change-Id: Id984c4e5c7cde4a5ecf3ae783441fc866d86d404
Reviewed-on: https://go-review.googlesource.com/21527
Reviewed-by: Chris Broadfoot <cbro@golang.org>
diff --git a/present/code.go b/present/code.go
index 5a29951..6e1a9cc 100644
--- a/present/code.go
+++ b/present/code.go
@@ -18,7 +18,7 @@
 // Is the playground available?
 var PlayEnabled = false
 
-// TOOD(adg): replace the PlayEnabled flag with something less spaghetti-like.
+// TODO(adg): replace the PlayEnabled flag with something less spaghetti-like.
 // Instead this will probably be determined by a template execution Context
 // value that contains various global metadata required when rendering
 // templates.