Connect: Fix SQLAlchemy connection strings

With SQLAlchemy, using a database name as the URL path will trip on the
CrateDB dialect, because CrateDB does not understand the notion of a
database.

TypeError: __init__() got an unexpected keyword argument 'database'

docs/connect/index.md

@@ -62,7 +62,7 @@ A native PostgreSQL connection string.
 `postgresql://<username>@<clustername>.cratedb.net/crate`
 
 A connection string for SQLAlchemy or Apache Flink.
-`crate://<username>@<clustername>.cratedb.net/crate?ssl=true`
+`crate://<username>@<clustername>.cratedb.net/?ssl=true`
 
 An HTTP URL to visit Admin UI.
 `https://<username>@<clustername>.cratedb.net:4200/`
@@ -104,7 +104,7 @@ A native PostgreSQL connection string.
 `postgresql://crate@localhost:5432/crate`
 
 A connection string for SQLAlchemy or Apache Flink.
-`crate://crate@localhost/crate`
+`crate://crate@localhost/`
 
 An HTTP URL to visit Admin UI.
 `http://crate@localhost:4200/`