The function `pg_create_logical_replication_slot()` is documented to have a `two_phase` argument(note the underscore), but the function instead requires `twophase`.
``` \df pg_catalog.pg_create_logical_replication_slot List of functions -[ RECORD 1 ]-------+---------------------------------------------------------------------------------------------------------------------------------
Schema | pg_catalog Name | pg_create_logical_replication_slot Result data type | record Argument data types | slot_name name, plugin name, temporary boolean DEFAULT false, twophase boolean DEFAULT false, OUT slot_name name, OUT lsn pg_lsn Type | func ```
This was introduced in commit 19890a06.
IMHO we should use the documented argument name `two_phase` and change the function to accept it.
