update undo deletion and about escape mode

Author: JeffKatzy

index.ipynb

@@ -82,9 +82,9 @@
     "\n",
     "* Make sure we are not in insert mode, but in escape mode\n",
     "    * *Remember we can tell we are in insert mode when we have a green border around our cell.*\n",
-    "    * To get out of insert mode and into escape mode, press the escape key.\n",
+    "    * To get out of insert mode and into escape mode, press shift + enter.  Another option is to press the escape key.\n",
     "    * You will no longer see a cell bordered in green.\n",
-    "* Then press the letter `b`"
+    "* Then press the letter `b` to create a new cell."
    ]
   },
   {
@@ -100,7 +100,7 @@
    "source": [
     "To delete a cell we once again should be in escape mode, and then press the `x` key.\n",
     "\n",
-    "Of course, we'll want a way to undo our deletion.  You can press d to undo deletion of a cell.  Note that this is different from `cmd + z`.  Pressing `cmd + z` undoes our changes inside of a cell, but pressing `d` from escape mode is to undo changing a cell in it's entirety."
+    "Of course, we'll want a way to undo our deletion.  From escape mode, you can press z to undo deletion of a cell.  Note that this is different from `cmd + z`.  Pressing `cmd + z` undoes our changes inside of a cell, but pressing `d` from escape mode is to undo changing a cell in it's entirety."
    ]
   },
   {
@@ -338,7 +338,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.5"
+   "version": "3.6.1"
   }
  },
  "nbformat": 4,