-- pg_tre 1.6.0 -> 1.6.1 upgrade.
--
-- 1.6.1 is a documentation-only release.  No SQL-catalog
-- changes; same on-disk format (v6) as 1.6.0; no REINDEX
-- required.  The new files (LIMITATIONS.md, the README and
-- doc/perf.md sizing additions, the CHANGELOG entry) explain
-- the build-time memory and lock-hold realities that one
-- production user hit on the 1.6.0 REINDEX path.  See
--
--     ALTER EXTENSION pg_tre UPDATE TO '1.6.1';
--
-- after installing the new shared library.  Intentionally empty.