The default sequence type is distributed

In #eng-pgd-bdr-harp, Jakub Wartak noticed the discrepancy and Petr Jelinek confirmed that this is something to be adjusted in the docs.

For reference: https://edb.slack.com/archives/C01GJ1C1BNH/p1668093242529229

product_docs/docs/pgd/4/bdr/sequences.mdx

@@ -63,15 +63,15 @@ determines the kind of sequence to create when the `CREATE SEQUENCE`
 command is executed or when a `serial`, `bigserial`, or
 `GENERATED BY DEFAULT AS IDENTITY` column is created. Valid settings are:
 
--   `local` (the default), meaning that newly created
+-   `local`, meaning that newly created
     sequences are the standard PostgreSQL (local) sequences.
 -   `galloc`, which always creates globally allocated range sequences.
 -   `snowflakeid`, which creates global sequences for BIGINT sequences that
      consist of time, nodeid, and counter components. You can't use it with
      INTEGER sequences (so you can use it for `bigserial` but not for `serial`).
 -   `timeshard`, which is the older version of SnowflakeId sequence and is provided for
     backward compatibility only. The SnowflakeId is preferred.
--   `distributed`, which is a special value that you can use only for
+-   `distributed` (the default), which is a special value that you can use only for
      `bdr.default_sequence_kind`. It selects `snowflakeid` for `int8`
      sequences (i.e., `bigserial`) and `galloc` sequence for `int4`
      (i.e., `serial`) and `int2` sequences.