Connection guide tech review (#50)

Author: norareidy

source/fundamentals/connections/connection-guide.txt

@@ -83,6 +83,9 @@ To specify your connection URI, pass it to the ``parse()``
 method of ``ClientOptions``. To set any other
 options, set the relevant field of the ``ClientOptions`` struct.
 
+If you do not specify any client options, create a client by passing your
+connection string to the ``Client::with_uri_str()`` method.
+
 .. TODO To learn more about connection options, see the
 .. :ref:`Connection Options <rust-connection-options>` reference.