feat: updating tutorial list

Author: dbirman

source/urchin/tutorial.rst

@@ -9,9 +9,10 @@ Tutorials
    tutorials/urchin-examples/basics/probes
    tutorials/urchin-examples/basics/cameras
    tutorials/urchin-examples/basics/fov_example
-   tutorials/urchin-examples/basics/Text
+   tutorials/urchin-examples/basics/text
    tutorials/urchin-examples/basics/videos
    tutorials/urchin-examples/basics/neurons_meshes
    tutorials/urchin-examples/basics/volumes
-   .. tutorials/urchin-examples/basics/lines
+   tutorials/urchin-examples/basics/lines
+   tutorials/urchin-examples/basics/3D
    .. tutorials/urchin-examples/basics/explode_example