Update WorkerThread.hs

Co-authored-by: Michael Peyton Jones <me@michaelpj.com>

ghcide/src/Development/IDE/Core/WorkerThread.hs

@@ -23,7 +23,9 @@ import           Control.Monad.Cont        (ContT (ContT))
 -- * `blockRunInThread` : accepts a `TQueue` and an action to run in separate thread and waits for the result.
 
 
--- | withWorkerQueue creates a new TQueue and runs the workerAction in a separate thread.
+-- | 'withWorkerQueue' creates a new 'TQueue', and launches a worker
+-- thread which polls the queue for requests and runs the given worker 
+-- function on them. 
 withWorkerQueue :: (t -> IO a) -> ContT () IO (TQueue t)
 withWorkerQueue workerAction = ContT $ \mainAction -> do
     q <- newTQueueIO