Update compatibilty with MBDB schema sequence 27

Author: yvanzo

docs/source/setup/mbdbschema.rst

@@ -2,11 +2,11 @@ MusicBrainz Database Schema
 ----
 
 Of course you'll need a MusicBrainz database somewhere to read the data from.
-The active database schema sequence must be `26` (or any future schema version
+The active database schema sequence must be `27` (or any future schema version
 if still compatible). Follow `announcements`_ from the MetaBrainz blog.
 
-Only Sir `1.y.z` is able to read from database of schema sequence `25` (or
-`26` which does not break anything, or any future schema if still compatible).
-It only reads (and sends) the data made available from schema sequence `25`.
+Only Sir `3.y.z` is able to read from database of schema sequence `27`
+(or any future schema if still compatible, but it reads and sends the
+data made available from schema sequence `27` only).
 
 .. _announcements: https://blog.metabrainz.org/category/schema-change-release/