Changed container repo to docker repo

The original statement was incorrect. Docker
repositories will report
an error, not container repositories.

Author: bangelic

guides/common/modules/con_composite-content-views-overview.adoc

@@ -51,5 +51,5 @@ When you create a version of the application, you publish a new version of the C
 You can also select the *Auto Publish* option when creating a Composite Content View, and then the Composite Content View is automatically republished when a Content View it includes is republished.
 
 .Repository restrictions
-Each container repository cannot be included more than once in a Composite Content View.
-For example, if you attempt to include two Content Views using the same container repository in a Composite Content View, {ProjectServer} reports an error.
+Docker repositories cannot be included more than once in a Composite Content View.
+For example, if you attempt to include two Content Views using the same docker repository in a Composite Content View, {ProjectServer} reports an error.