What are these announcements announcing?
Well, they seek to encourage forum authors to turn their great solution into an article! Sometimes, the question is a little vague, and so when all is said and done, the author might have written something more like a troubleshooting guide of all the different possible solutions.
And you could link back to that forum thread (many do), but it's still not laid out in the best way to make it easy for the readers to understand. But then the title also is often not the best description of the problem. So the solution is to turn your answers into a Wiki article, and then you can link to that in future forum threads, which is laid out in a way that's easier to read and understand.
The thread goes on to give you instructions, as well as a list of winners from the June competition.