[TSD] docs: Add annotations for ENABLE_DJANGO_ADMIN_SITE feature flag

[jramnai]

Description

This PR adds annotations for ENABLE_DJANGO_ADMIN_SITE feature flag.

Supporting information

https://github.com/edx/edx-platform/pull/829

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[natabene]

@jramnai Thank you for your contribution!

[edx-status-bot]

Your PR has finished running tests. There were no failures.

[BbrSofiane]

This looks good to me.

@pdpinch This is ready to merge.

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@jramnai 🎉 Your pull request was merged!

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[pdpinch]

Thanks again @jramnai and @BbrSofiane !

I have to say, this toggle seems like it should be deprecated and removed to me, but there's a separate process for that.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.