Merge pull request #1 from dariatrainor/dariatrainor-patch-1

Removed future reference to the previous chapter

etc/doc/tutorial/03.1-Triggering-Samples.md

@@ -36,9 +36,7 @@ play 36
 Notice how Sonic Pi doesn't wait for a sound to finish before starting
 the next sound. The `sleep` command only describes the separation of the
 *triggering* of the sounds. This allows you to easily layer sounds
-together creating interesting overlap effects. Later in this tutorial
-we'll take a look at controlling the *duration* of sounds with
-envelopes.
+together creating interesting overlap effects.
 
 
 ## Discovering Samples