Doc updates (#791)

Updates for better displaying the documentation in the website.

docs/child.asciidoc

@@ -1,4 +1,4 @@
-= Creating a child client
+== Creating a child client
 
 There are some use cases where you may need multiple instances of the client. You can easily do that by calling `new Client()` as many times as you need, but you will lose all the benefits of using one single client, such as the long living connections and the connection pool handling. +
 To avoid this problem the client offers a `child` API, which returns a new client instance that shares the connection pool with the parent client. +