OEP-49 remove deprecated advice

[deborahgu]

OEP 0049 has a section saying

The __init__.py file should contain a line for the default_app_config for the app.

That functionality is deprecated and removed from django (4.1 release notes). The definition has already been partially removed from our various apps.

We should update the documentation to remove this section.

[mcfly-github]

Hi @deborahgu I made the documentation update. Ready to push if you would like to see.

[sarina]

@mcfly-github - please open a pull request to this repo so we can review!

[mcfly-github]

@sarina Do I need any permission for the push? I got the following error:
git push origin refs/heads/update-oep-0049
ERROR: Permission to openedx/open-edx-proposals.git denied to mcfly-github. fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.

[sarina]

Hi @mcfly-github - you'll need to make a fork and push to that. You can make your PR off your fork.

[mcfly-github]

Thank you @sarina I have done with that.