Rollup merge of #112172 - tshepang:patch-1, r=Mark-Simulacrum
doc: improve explanation
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@ -91,7 +91,7 @@ impl Once {
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/// return).
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///
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/// If the given closure recursively invokes `call_once` on the same [`Once`]
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/// instance the exact behavior is not specified, allowed outcomes are
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/// instance, the exact behavior is not specified: allowed outcomes are
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/// a panic or a deadlock.
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///
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/// # Examples
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