Clarify temporal uncertainty regarding time machines

[nightkr]

Description

Due to the nature of temporal paradoxes, we can't be certain about which case is actually true in the current timeline.

Definition of Done Checklist

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Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
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• Links to generated (nightly) docs added
• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
• Add type/experimental label & add to the experimental features tracker

[dervoeti]

LGTM. Probably worth mentioning this in the release notes.