sort LANGUAGE pragmas, use my preferred module header format

src/Control/Placeholder.hs

@@ -1,24 +1,30 @@
+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
-{-# LANGUAGE PolyKinds #-}
-{-# LANGUAGE ViewPatterns #-}
-{-# LANGUAGE PatternSynonyms #-}
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE ImplicitParams #-}
 {-# LANGUAGE MagicHash #-}
+{-# LANGUAGE PatternSynonyms #-}
+{-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE ImplicitParams #-}
-{-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE Trustworthy #-}
-{-# LANGUAGE BlockArguments #-}
-{-# LANGUAGE CPP #-}
+{-# LANGUAGE ViewPatterns #-}
+
+-- |
+-- Copyright  : (c) Edward Kmett 2024
+-- License    : BSD-2-Clause OR Apache-2.0
+-- Maintainer : Edward Kmett <[email protected]>
+-- Stability  : experimental
+-- Portability: non-portable
+--
+-- Various functions to indicate unfinished or generally unimplemented code 
 
 #if __GLASGOW_HASKELL__ >= 980
 #define WARNING_IN_XTODO WARNING in "x-todo"
 #else
 #define WARNING_IN_XTODO WARNING
 #endif
 
-{- | The 'Control.Placeholder' module implements various functions to indicate 
-     unfinished or generally unimplemented code 
--}
 module Control.Placeholder
   (
   -- * Combinators