Update the examples

docs/examples/tornado_basic.rst

@@ -29,14 +29,6 @@ add a widget, call PUT on /widget, to update a widget call POST on /widget/[SKU]
             """
             self.session = queries.TornadoSession()
-        @gen.coroutine
-        def prepare(self):
-            try:
-                yield self.session.validate()
-            except queries.OperationalError as error:
-                logging.error('Error connecting to the database: %s', error)
-                raise web.HTTPError(503)
-
         def options(self, *args, **kwargs):
             """Let the caller know what methods are supported

docs/examples/tornado_multiple.rst

@@ -15,13 +15,6 @@ request and will wait until all queries are complete before progressing:
             self.session = queries.TornadoSession()
         @gen.coroutine
-        def prepare(self):
-            try:
-                yield self.session.validate()
-            except queries.OperationalError as error:
-                logging.error('Error connecting to the database: %s', error)
-                raise web.HTTPError(503)
-
         @gen.coroutine
         def get(self, *args, **kwargs):