Reword slightly logs generated for index stats in autovacuum
Using "remain" is confusing, as it implies that the index file can
shrink.  Instead, use "in total".
Per discussion with Peter Geoghegan.
Discussion:
@@ -703,7 +703,7 @@ heap_vacuum_rel(Relation onerel, VacuumParams *params,
continue;
appendStringInfo(&buf,
- _("index \"%s\": pages: %u remain, %u newly deleted, %u currently deleted, %u reusable\n"),
+ _("index \"%s\": pages: %u in total, %u newly deleted, %u currently deleted, %u reusable\n"),
indnames[i],
stats->num_pages,
stats->pages_newly_deleted,
