De-emphasize notion of "default driver" (DBAPI)

Fixes: #6960

Even though a default driver still exists for
each dialect, remove most usages of `dialect://`
to encourage users to explicitly specify
`dialect+driver://`

Change-Id: I0ad42167582df509138fca64996bbb53e379b1af

2 files changed, 2 insertions, 2 deletions

diff --git a/lib/sqlalchemy/dialects/postgresql/base.py b/lib/sqlalchemy/dialects/postgresql/base.py
index 87afa0293..a00c26e87 100644
--- a/lib/sqlalchemy/dialects/postgresql/base.py
+++ b/lib/sqlalchemy/dialects/postgresql/base.py
@@ -346,7 +346,7 @@ were set to include ``test_schema``, and we invoked a table
 reflection process as follows::
 
     >>> from sqlalchemy import Table, MetaData, create_engine, text
-    >>> engine = create_engine("postgresql://scott:tiger@localhost/test")
+    >>> engine = create_engine("postgresql+psycopg2://scott:tiger@localhost/test")
     >>> with engine.connect() as conn:
     ...     conn.execute(text("SET search_path TO test_schema, public"))
     ...     meta = MetaData()
diff --git a/lib/sqlalchemy/dialects/postgresql/json.py b/lib/sqlalchemy/dialects/postgresql/json.py
index 2acf177f5..ef046e3ae 100644
--- a/lib/sqlalchemy/dialects/postgresql/json.py
+++ b/lib/sqlalchemy/dialects/postgresql/json.py
@@ -159,7 +159,7 @@ class JSON(sqltypes.JSON):
     using psycopg2, the DBAPI only allows serializers at the per-cursor
     or per-connection level.   E.g.::
 
-        engine = create_engine("postgresql://scott:tiger@localhost/test",
+        engine = create_engine("postgresql+psycopg2://scott:tiger@localhost/test",
                                 json_serializer=my_serialize_fn,
                                 json_deserializer=my_deserialize_fn
                         )