added a note to what's new

docs/source/whatsnew/pr/notebook-tour.rst

@@ -0,0 +1,6
+Interactive Notebook Tour
+-------------------------
+
+Familiarize yourself with the updated notebook user interface, including an
+explanation of Edit and Command modes, by going through the short guided tour
+which can be started from the Help menu.

IPython/html/static/notebook/js/tour.js

@@ -42,7 +42,7 var tour_steps = [
     element: "#modal_indicator",
     title: "Mode Indicator",
     placement: 'bottom',
-    content: "IPython has two modes: Edit Mode and Command Mode. In this area, an indicator can appear to tell you which mode you are in.",
+    content: "The Notebook has two modes: Edit Mode and Command Mode. In this area, an indicator can appear to tell you which mode you are in.",
     onShow: function(tour) { command_icon_hack(); }
   }, {
     element: "#modal_indicator",