PyDoc: resolve duplicate module warnings

Remove submodule listings from the module docstring,
as this information already exists in the generator.

source/blender/python/gpu/gpu_py_api.c

@@ -106,19 +106,8 @@ success:
  * \{ */
 
 PyDoc_STRVAR(GPU_doc,
-             "This module provides Python wrappers for the GPU implementation in Blender. "
-             "Some higher level functions can be found in the `gpu_extras` module. "
-             "\n\n"
-             "Submodules:\n"
-             "\n"
-             ".. toctree::\n"
-             "   :maxdepth: 1\n"
-             "\n"
-             "   gpu.types.rst\n"
-             "   gpu.shader.rst\n"
-             "   gpu.matrix.rst\n"
-             "   gpu.select.rst\n"
-             "\n");
+             "This module provides Python wrappers for the GPU implementation in Blender.\n"
+             "Some higher level functions can be found in the `gpu_extras` module.");
 static struct PyModuleDef GPU_module_def = {
     PyModuleDef_HEAD_INIT,
     .m_name = "gpu",