Add examples to document the return type of quickselect functions#121187

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Takashiidobe:takashi/examples-for-quickselect

Feb 17, 2024

Commits on Feb 16, 2024

Add examples to document the return type of `select_nth_unstable`, `select_nth_unstable_by`, and `select_nth_unstable_by_key`.
Takashiidobe
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