[doc] Fix syntax in example.rst (UniversalRobots#207)

The list wasn't formatted correctly

doc/example.rst

@@ -5,7 +5,8 @@ Example driver
 In the ``examples`` subfolder you will find a minimal example of a running driver. It starts an
 instance of the ``UrDriver`` class and prints the RTDE values read from the controller. To run it make
 sure to
- * have an instance of a robot controller / URSim running at the configured IP address (or adapt the
-   address to your needs)
- * run it from the package's main folder (the one where this README.md file is stored), as for
-   simplicity reasons it doesn't use any sophisticated method to locate the required files.
+
+* have an instance of a robot controller / URSim running at the configured IP address (or adapt the
+  address to your needs)
+* run it from the package's main folder (the one where this README.md file is stored), as for
+  simplicity reasons it doesn't use any sophisticated method to locate the required files.