chore: remove duplicated words in Listener and Plan comments

Signed-off-by: Aiden Park <275402320+vip892766gma@users.noreply.github.com>

src/PostgREST/Listener.hs

@@ -56,7 +56,7 @@ retryingListen appState hasDbListenerBug = do
       -- loop running the listener
       retryingListen appState (isDbListenerBug err)
 
-  -- Execute the listener with with error handling
+  -- Execute the listener with error handling
   handle onError $ do
     -- Make sure we don't leak connections on errors
     bracket

src/PostgREST/Plan.hs

@@ -126,7 +126,7 @@ data InspectPlan = InspectPlan {
   , ipSchema   :: Schema
   }
 
--- A Plan may use the the database or not
+-- A Plan may use the database or not
 data ActionPlan
   = Db DbActionPlan
   | NoDb InfoPlan