DOC: Better code gallery index page.

src/doc/gallery/index.rst

@@ -11,7 +11,6 @@ This chapter collects code examples which can be immediately run against an empt
 
 .. toctree::
    :maxdepth: 2
-   :caption: Contents:
-   :hidden:
+   :caption: The code examples:
 
    simulation

src/doc/gallery/simulation.rst

@@ -7,7 +7,7 @@ This code example
 1. sets up the data model
 2. runs simulations
 3. stores the simulation parameters and results into CaosDB
-4. retrieves the parameters for interesting results
+4. retrieves the parameters for interesting results.
 
 :download:`Download code<simulation.py>`