* GetSnapshotData() cannot change while ProcArrayLock is held. Snapshot
* contents only depend on transactions with xids and xactCompletionCount
* is incremented whenever a transaction with an xid finishes (while
- * holding ProcArrayLock) exclusively). Thus the xactCompletionCount check
+ * holding ProcArrayLock exclusively). Thus the xactCompletionCount check
* ensures we would detect if the snapshot would have changed.
*
* As the snapshot contents are the same as it was before, it is safe to