Update outdated comment for TransactionIdSetTreeStatus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