Update outdated comment for TransactionIdSetTreeStatus

Commit 06da3c570f changed the way subtransactions are marked as
SUBCOMMITTED, but the example it included actually documented the old
way. Update it.

Author: Japin Li
Discussion: https://www.postgresql.org/message-id/MEYP282MB16690BC96DFBE08CC857E1E3B6319%40MEYP282MB1669.AUSP282.PROD.OUTLOOK.COM

diff --git a/src/backend/access/transam/clog.c b/src/backend/access/transam/clog.c
index a7dfcfb4da41178d0f148d34143720f0a88f6c09..77d9894dab3cd1c4feb66b8fa3c1aa3fb9e01b90 100644 (file)
--- a/src/backend/access/transam/clog.c
+++ b/src/backend/access/transam/clog.c
@@ -146,9 +146,7 @@ static void TransactionIdSetPageStatusInternal(TransactionId xid, int nsubxids,
  *                 page2: set t2,t3 as sub-committed
  *                 page3: set t4 as sub-committed
  *     2. update page1:
- *                 set t1 as sub-committed,
- *                 then set t as committed,
-                   then set t1 as committed
+ *                 page1: set t,t1 as committed
  *     3. update pages2-3:
  *                 page2: set t2,t3 as committed
  *                 page3: set t4 as committed