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Fix some typos, grammar and style in docs and comments
The portions fixing the documentation are backpatched where needed. Author: Justin Pryzby Discussion: https://postgr.es/m/20210210235557.GQ20012@telsasoft.com backpatch-through: 9.6
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@@ -2075,7 +2075,7 @@ GetSnapshotDataReuse(Snapshot snapshot)
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* holding ProcArrayLock) exclusively). Thus the xactCompletionCount check
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* ensures we would detect if the snapshot would have changed.
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*
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* As the snapshot contents are the same as it was before, it is is safe
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* As the snapshot contents are the same as it was before, it is safe
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* to re-enter the snapshot's xmin into the PGPROC array. None of the rows
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* visible under the snapshot could already have been removed (that'd
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* require the set of running transactions to change) and it fulfills the
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