This is a bit strange. Maybe it should say "see the Roadmap section at [bug tracker]" (I also think "bug tracker" should be two words).

However, we do not have a roadmap in the bug tracker currently and I do not actually think using github milestones is convenient since there is no general overview, only the per-project list which requires a lot of clicking around. For a general roadmap, it would be much easier to use a github wiki page, for example.