Fixed Changelog typo

Author: Ian McMahon

CHANGELOG.rst

@@ -2,7 +2,7 @@
 ---------------------------------
 - Added a URDF Fragment publishing example to demonstrate URDF additions to a Real Baxter
 - The head_pan speed range has been changed to [0, 1.0]. Updated the examples & head action client accordingly
-- Updated Ditial IO example to use the new light names for the navigator
+- Updated Digtial IO example to use the new light names for the navigator
 - Remapped Joy stick example's Logitech controller to be similar to the Xbox controls
 - Fixed a bug causing Gripper timing to lag in the joint playback example