Update admin.rst

[JonSpeare]

It was unclear to me and would have made the instructions easier to follow.

Submitting Pull Requests

General

• Make sure you use semantic commit messages.
  Examples: "fix(google): Fixed foobar bug", "feat(accounts): Added foobar feature".
• All Python code must formatted using Black, and clean from pep8 and isort issues.
• JavaScript code should adhere to StandardJS.
• If your changes are significant, please update ChangeLog.rst.
• If your change is substantial, feel free to add yourself to AUTHORS.

Provider Specifics

In case you add a new provider:

• Make sure unit tests are available.
• Add an entry of your provider in test_settings.py::INSTALLED_APPS and docs/installation.rst::INSTALLED_APPS.
• Add documentation to docs/providers/<provider name>.rst and docs/providers/index.rst Provider Specifics toctree.
• Add an entry to the list of supported providers over at docs/overview.rst.

[coveralls]

coverage: 95.708%. remained the same
when pulling 8d46031 on JonSpeare:patch-1
into f6577fa on pennersr:main.