Update ui.mdx

docs/src/pages/docs/Connecting to Databases/ui.mdx

@@ -64,7 +64,7 @@ When the user selects a database not in this list they will see the old dialog a
 1. `parameters_schema`: a Marshmallow schema defining the parameters needed to configure the database. For Postgres this includes username, password, host, port, etc. ([see](https://github.com/apache/superset/blob/accee507c0819cd0d7bcfb5a3e1199bc81eeebf2/superset/db_engine_specs/base.py#L1309-L1320)).
 2. `default_driver`: the name of the recommended driver for the DB engine spec. Many SQLAlchemy dialects support multiple drivers, but usually one is the official recommendation. For Postgres we use "psycopg2".
 3. `sqlalchemy_uri_placeholder`: a string that helps the user in case they want to type the URI directly.
-4. `encryption_parameters`: parameters used to build the URI when the user opts for an encrypted connection. For Postgres this is `{"sslmode": "verify-ca"}`.
+4. `encryption_parameters`: parameters used to build the URI when the user opts for an encrypted connection. For Postgres this is `{"sslmode": "require"}`.
 
 In addition, the DB engine spec must implement these class methods: