Fix comments that misspelled TransactionIdIsInProgress, per Heikki.

src/backend/access/transam/twophase.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *		$PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.35 2007/09/08 20:31:14 tgl Exp $
+ *		$PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.36 2007/09/21 16:32:19 tgl Exp $
  *
  * NOTES
  *		Each global transaction is associated with a global transaction
@@ -353,7 +353,7 @@ MarkAsPrepared(GlobalTransaction gxact)
 	LWLockRelease(TwoPhaseStateLock);
 
 	/*
-	 * Put it into the global ProcArray so TransactionIdInProgress considers
+	 * Put it into the global ProcArray so TransactionIdIsInProgress considers
 	 * the XID as still running.
 	 */
 	ProcArrayAdd(&gxact->proc);
@@ -979,8 +979,8 @@ EndPrepare(GlobalTransaction gxact)
 	 * NB: a side effect of this is to make a dummy ProcArray entry for the
 	 * prepared XID.  This must happen before we clear the XID from MyProc,
 	 * else there is a window where the XID is not running according to
-	 * TransactionIdInProgress, and onlookers would be entitled to assume the
-	 * xact crashed.  Instead we have a window where the same XID appears
+	 * TransactionIdIsInProgress, and onlookers would be entitled to assume
+	 * the xact crashed.  Instead we have a window where the same XID appears
 	 * twice in ProcArray, which is OK.
 	 */
 	MarkAsPrepared(gxact);