Update notebook example to include implied print

Author: znorman-harris

extension/example-notebooks/hello-world-idl.idlnb

@@ -120,6 +120,61 @@
       "metadata": {},
       "outputs": []
     },
+    {
+      "type": "markdown",
+      "content": [
+        "### Notebook Cells Behave like the IDL Console"
+      ],
+      "metadata": {},
+      "outputs": []
+    },
+    {
+      "type": "markdown",
+      "content": [
+        "At a high-level, notebook cells are executed like statements in the IDL Console, but with a few, positive differences.",
+        "",
+        "First, you can create variables and print them just by typing their names. Variables printed this way have a special semantic token coloring applied to differentiate them from procedures."
+      ],
+      "metadata": {},
+      "outputs": []
+    },
+    {
+      "type": "code",
+      "content": [
+        "myAwesomeVar = 'I''m printing and I know it!'",
+        "myAwesomeVar"
+      ],
+      "metadata": {},
+      "outputs": []
+    },
+    {
+      "type": "markdown",
+      "content": [
+        "When you run the cell above, it should print out the text `I'm printing and I know it!`",
+        "",
+        "You can also type statements similar to the IDL Console, such as addition and they will be printed as well."
+      ],
+      "metadata": {},
+      "outputs": []
+    },
+    {
+      "type": "code",
+      "content": [
+        "1 + 2 + 3"
+      ],
+      "metadata": {},
+      "outputs": []
+    },
+    {
+      "type": "markdown",
+      "content": [
+        "> Pro tip: Printing statements like this only apply to code that lives outside of procedure or function definitions.",
+        ">",
+        "> If you put the above code in a routine definition, you would get a syntax error."
+      ],
+      "metadata": {},
+      "outputs": []
+    },
     {
       "type": "markdown",
       "content": [