Add a caption to demo docs

Author: ericholscher

demo_docs/source/index.rst

@@ -14,6 +14,7 @@ Contents:
 
 .. toctree::
     :maxdepth: 2
+    :caption: Sweet Docs
 
     demo
     list
@@ -220,4 +221,4 @@ Here I am making a citation [1]_
 Download links
 ==============
 
-:download:`This long long long long long long long long long long long long long long long download link should be blue with icon, and should wrap white-spaces <static/yi_jing_01_chien.jpg>`
+:download:`This long long long long long long long long long long long long long long long download link should be blue with icon, and should wrap white-spaces <static/yi_jing_01_chien.jpg>`