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Fix misc typos, mostly in comments.
A collection of typos I happened to spot while reading code, as well as grepping for common mistakes. Backpatch to all supported versions, as applicable, to avoid conflicts when backporting other commits in the future.
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@ -2555,7 +2555,7 @@ SetOffsetVacuumLimit(void)
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/*
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* NB: Have to prevent concurrent truncation, we might otherwise try to
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* lookup a oldestMulti that's concurrently getting truncated away.
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* lookup an oldestMulti that's concurrently getting truncated away.
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*/
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LWLockAcquire(MultiXactTruncationLock, LW_SHARED);
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@ -2731,7 +2731,7 @@ find_multixact_start(MultiXactId multi, MultiXactOffset *result)
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/*
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* Flush out dirty data, so PhysicalPageExists can work correctly.
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* SimpleLruFlush() is a pretty big hammer for that. Alternatively we
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* could add a in-memory version of page exists, but find_multixact_start
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* could add an in-memory version of page exists, but find_multixact_start
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* is called infrequently, and it doesn't seem bad to flush buffers to
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* disk before truncation.
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*/
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