Merge pull request docker#2094 from adrian-plata/experimental-note

Adding experimental feature info

docs/reference/commandline/cli.md

@@ -282,6 +282,14 @@ Following is a sample `config.json` file:
 
 ### Experimental features
 
+Experimental features provide early access to future product functionality.
+These features are intended only for testing and feedback as they may change
+between releases without warning or can be removed entirely from a future
+release.
+
+> Experimental features must not be used in production environments.
+{: .warning }
+
 To enable experimental features, edit the `config.json` file and set
 `experimental` to `enabled`. The example below enables experimental features
 in a `config.json` file that already enables a debug feature.