Added a note for more information of iPython

Just the same as quick start  guide for RE1, added a note with more information about how to use iPython.

getting_started/quick_start_guide_re2.md

@@ -194,6 +194,7 @@ robot.end_of_arm.move_to('stretch_gripper',-50)
 robot.stow()
 robot.stop()
 ```
+!!! note If you haven't use iPython before you can copy all the code and paste it in the terminal instead of line by line! Also if you want to exit the iPython prompt write exit()
 
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