Use "WAL segment" instead of "log segment" consistently in user-facing messages

2022-09-14 22:41:18 Tom Lane (tgl) Closed in commitfest 2022-09 with status: Committed 2022-09-14 22:08:47 Tom Lane (tgl) Added tgl as committer 2022-08-01 17:17:02 Jacob Champion (jchampion) Closed in commitfest 2022-07 with status: Moved to next CF 2022-07-19 16:58:02 Nathan Bossart (bossartn) New status: Ready for Committer 2022-07-18 10:54:33 Bharath Rupireddy (bharathrupireddy) New status: Needs review 2022-04-25 19:54:47 Nathan Bossart (bossartn) New status: Waiting on Author 2022-03-31 15:46:44 Nathan Bossart (bossartn) Added bossartn as reviewer 2022-03-02 06:11:01 Bharath Rupireddy (bharathrupireddy) Changed authors to Bharath Rupireddy (bharathrupireddy) 2022-03-02 06:10:50 Bharath Rupireddy (bharathrupireddy) Attached mail thread CALj2ACUeXa8tDPaiTLexBDMZ7hgvaN+RTb957-cn5qwv9zf-MQ@mail.gmail.com 2022-03-02 06:10:50 Bharath Rupireddy (bharathrupireddy) Created patch record