Output types example: Update README

examples/output_types/README.md

@@ -1,6 +1,11 @@
-ScriptForm raw example
-======================
+ScriptForm output example
+=========================
 
-Raw callbacks can be used to obtain more control over what is sent to the
-user's browser. For instance, you can stream contents to the browser, send
-files, show images, etc.
+Output tpyes determine how Scriptform handles the output from a callback. The
+options are: `escaped` (default), `html` and `raw`. The `escaped` option wraps
+the output of the callback in PRE tags and escapes any HTML entities. The
+`html` option doesn't, which lets the script include HTML formatting in the
+output. The `raw` option directly streams the output of the script to the
+browser. This allows you to stream images, binary files, etc directly to the
+browser. The script should include a full HTTP response including appropriate
+headers.