Discoverability is a concept that goes well beyond the scope of Bill C-11. The CDCE recently produced a report on the issue. But it goes far beyond simply making content findable.
In the context of a Broadcasting Act that applies to online services, it could be requirements to highlight specific content (Canadian, francophone, aboriginal, etc.) via the recommendation tools of those services.
On sites with catalogs of thousands or even millions of items of content, recommendation mechanisms make it possible to discover content that the user would not otherwise have found.