Refactor: GPU: Remove unnecessary C wrappers for textures

This is the first step into merging `DRW_gpu_wrapper.hh` into
the GPU module.

This is very similar to #119825.

Pull Request: https://projects.blender.org/blender/blender/pulls/142732

source/blender/python/gpu/gpu_py_shader_create_info.cc

@@ -730,7 +730,8 @@ PyDoc_STRVAR(
     "\n"
     "   :arg slot: The image resource index.\n"
     "   :type slot: int\n"
-    "   :arg format: The GPUTexture format that is passed to the shader. Possible values are:\n"
+    "   :arg format: The blender::gpu::Texture format that is passed to the shader. Possible "
+    "values are:\n"
     "\n" PYDOC_TEX_FORMAT_ITEMS
     "   :type format: str\n"
     "   :arg type: The data type describing how the image is to be read in the shader. "