rustdoc: Fix rendering of cross-crate target_features

[Cyberhet]

Fixes #162207

[rustbot]

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[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[Cyberhet]

Any changes to be made

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[notriddle]

@bors r+

Thanks a bunch for fixing this problem!

[rust-bors]

📌 Commit 1d2cf4f has been approved by notriddle

It is now in the queue for this repository.

[notriddle]

@bors r-

Wait, hold on. My mistake. I didn't realize you'd reassigned it, @fmease.

[rust-bors]

This pull request was unapproved.

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[fmease]

Yes, I fear there are some non-trivialities that's why I ended up creating the linked GH issue instead of submitting a PR myself. I didn't have the time at that time to more deeply analyze various interactions & edge cases.