fix headers

notebooks/Coase.ipynb

@@ -23,7 +23,7 @@
     }
    },
    "source": [
-    "**Note:** this jupyter notebook mixes text, math, visualizations and python code.  To keep things uncluttered most of the code was placed in a [code section](#codesection) at the end.  If you are running on a jupyter server and want to recreate or modify content or run interactive widgets, navigate to the code section for instructions first.\n",
+    "**Note:** Most of the code to generate visuals and results below is in a [code section](#codesection) at the end of this notebook.  To run interactive widgets or modify content, navigate to the code section for instructions.\n",
     "\n",
     "**Slideshow mode**: this notebook can be viewed as a slideshow by pressing Alt-R if run on a server."
    ]
@@ -570,7 +570,6 @@
   {
    "cell_type": "markdown",
    "metadata": {
-    "collapsed": true,
     "slideshow": {
      "slide_type": "skip"
     }