docs: updated no-delete-expression roadmap equivalent to no-dynamic-delete

[JoshuaKGoldberg]

I noticed in typescript-eslint/tslint-to-eslint-config#1068 that this is off; no-dynamic-delete was ported over.

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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