Updated the example to include new hook functions
material_import_poll and on_material_import as well
as the new import_texture and export_texture
utilities which were introduced in #131559.
Also reformatted the existing documentation to include
subheaders and internal links, as the previous paragraph
format became difficult to follow.
Pull Request: https://projects.blender.org/blender/blender/pulls/132259
8285d2d82e