docs(createConnector): add links for more info to deprecation (#403)

It's always useful to immediatly learn more and learn the solution of some problem that has been warned to you if available. React itself has short links for warnings (fb.me, we could also do that for alg.li, but maybe that's for later)

packages/react-instantsearch/src/core/createConnector.js

@@ -293,7 +293,11 @@ export default function createConnector(connectorDesc) {
                 'only to access the `searchState` and the `searchResults` through `getProvidedProps`.' +
                 'We are now provided a dedicated API' +
                 ' the `connectStateResults` connector that you should use instead. The `createConnector` API will be ' +
-                'soon deprecated and will break in future next major versions.'
+                'soon deprecated and will break in future next major versions.' +
+                '\n\n' +
+                'See more at https://community.algolia.com/react-instantsearch/connectors/connectStateResults.html' +
+                '\n' +
+                'and https://community.algolia.com/react-instantsearch/guide/Conditional_display.html'
             );
           }
         }