Add some commands to misc section in CLI guide

Add these two command:

* `rails initializers`
* `rails middleware`

guides/source/command_line.md

@@ -601,6 +601,8 @@ The `tmp:` namespaced commands will help you clear and create the `Rails.root/tm
 
 ### Miscellaneous
 
+* `rails initializers` prints out all defined initializers in the order they are invoked by Rails.
+* `rails middleware` lists Rack middleware stack enabled for your app.
 * `rails stats` is great for looking at statistics on your code, displaying things like KLOCs (thousands of lines of code) and your code to test ratio.
 * `rails secret` will give you a pseudo-random key to use for your session secret.
 * `rails time:zones:all` lists all the timezones Rails knows about.