Remove no-longer accurate sentences

docs/importing-postgres.md

@@ -27,8 +27,6 @@ ansible-playbook -i inventory/hosts setup.yml \
 --tags=import-postgres
 ```
 
-We specify the `synapse` database as the default import database. If your dump is a single-database dump (`pg_dump`), then we need to tell it where to go to. If you're redefining `matrix_synapse_database_database` to something other than `synapse`, please adjust it here too. For database dumps spanning multiple databases (`pg_dumpall`), you can remove the `postgres_default_import_database` definition (but it doesn't hurt to keep it too).
-
 **Note**: `<server-path-to-postgres-dump.sql>` must be a file path to a Postgres dump file on the server (not on your local machine!).