Remove reference to experimental release

Remove reference to experimental releases as it is really a nightly
channel rather than a scheduled release.

Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>

experimental/README.md

@@ -42,7 +42,7 @@ Unlike the regular Docker binary, the experimental channels is built and updated
 
     This command downloads a test image and runs it in a container.
 
-## Experimental features in this Release
+## Current experimental features
 
 * [Support for Docker plugins](plugins.md)
 * [Volume plugins](plugins_volume.md)
@@ -51,4 +51,4 @@ Unlike the regular Docker binary, the experimental channels is built and updated
 
 Each feature's documentation includes a list of proposal pull requests or PRs associated with the feature. If you want to comment on or suggest a change to a feature, please add it to the existing feature PR.  
 
-Issues or problems with a feature? Inquire for help on the `#docker` IRC channel or in on the [Docker Google group](https://groups.google.com/forum/#!forum/docker-user).  
+Issues or problems with a feature? Inquire for help on the `#docker` IRC channel or in on the [Docker Google group](https://groups.google.com/forum/#!forum/docker-user).