btree/node.rs: remove incorrect comment from pop_internal_level docs

[btj]

No description provided.

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @cuviper (or someone else) some time within the next two weeks.

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[cuviper]

Is there some discussion or other context indicating that this was incorrect?

[btj]

No. I was reading the source file and noticed this comment, which seems pretty obviously wrong. The root is being deallocated, so there's no way that references to it remain valid. (Context: I'm considering having a go at AWS Rust Verification Contest Challenge 4 with my VeriFast tool.)

[cuviper]

LGTM, thanks!

@bors r+ rollup

[bors]

📌 Commit 810e4c1 has been approved by cuviper

It is now in the queue for this repository.