Improve wal_decode_buffer_size description some more

Per Thomas Munro

Discussion: https://postgr.es/m/CA+hUKGJ9wP9kpvgoxHvqA=4g1d9-y_w3LhhdhFVU=mFiqjwHww@mail.gmail.com

Author: alvherre

src/backend/utils/misc/guc.c

@@ -2836,8 +2836,8 @@ static struct config_int ConfigureNamesInt[] =
 
 	{
 		{"wal_decode_buffer_size", PGC_POSTMASTER, WAL_RECOVERY,
-			gettext_noop("Maximum buffer size for reading ahead in the WAL during recovery."),
-			gettext_noop("This controls the maximum distance we can read ahead in the WAL to prefetch data blocks referenced therein."),
+			gettext_noop("Buffer size for reading ahead in the WAL during recovery."),
+			gettext_noop("This controls the maximum distance we can read ahead in the WAL to prefetch referenced data blocks."),
 			GUC_UNIT_BYTE
 		},
 		&wal_decode_buffer_size,