Fix stray url from beta-docs warning (remove aws bucket URI)

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)

docs/theme/mkdocs/beta_warning.html

@@ -27,6 +27,5 @@
 		<span>{% if docker_version != docker_version|replace("-dev", "bingo") %}{{ docker_branch }} development branch{% else %}beta{% endif %}</span>
 		documentation for Docker version {{ docker_version }}.</h4>
 	Please go to <a href="http://docs.docker.io">http://docs.docker.io</a> for the current Docker release documentation.
-	{{ aws_bucket }}
 </div>
 {% endif %}