Update links for the OverloadedLists extension (#933)

Fixes #932

Author: konsumlamm

containers/docs/map.rst

@@ -77,11 +77,11 @@ The following GHCi session shows some of the basic map functionality::
     > fromList [(1,"one"),(2,"two"),(3,"new three"),(4,"newer four")]
 
 .. TIP:: You can use the `OverloadedLists
-	 <https://ghc.haskell.org/trac/ghc/wiki/OverloadedLists>`_ extension so
-	 you don't need to write ``fromList [1, 2, 3]`` everywhere; instead you
-	 can just write ``[1, 2, 3]`` and if the function is expecting a map it
-	 will be converted automatically! The code here will continue to use
-	 ``fromList`` for clarity though.
+	 <https://downloads.haskell.org/ghc/latest/docs/users_guide/exts/overloaded_lists.html>`_
+     extension so you don't need to write ``fromList [1, 2, 3]`` everywhere;
+     instead you can just write ``[1, 2, 3]`` and if the function is
+     expecting a map it will be converted automatically! The code here
+     will continue to use ``fromList`` for clarity though.
 
 
 Importing Map and IntMap

containers/docs/sequence.rst

@@ -70,7 +70,7 @@ The following GHCi session shows some of the basic sequence functionality::
     > 3
 
 .. TIP:: You can use the `OverloadedLists
-	 <http://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts.html#overloaded-lists>`_
+	 <https://downloads.haskell.org/ghc/latest/docs/users_guide/exts/overloaded_lists.html>`_
 	 extension so you don't need to write ``fromList [1, 2, 3]`` everywhere.
 	 Instead you can just write ``[1, 2, 3]`` and if the function is
 	 expecting a sequence it will be converted automatically! The code here

containers/docs/set.rst

@@ -74,11 +74,11 @@ The following GHCi session shows some of the basic set functionality::
 
 
 .. TIP:: You can use the `OverloadedLists
-	 <https://ghc.haskell.org/trac/ghc/wiki/OverloadedLists>`_ extension so
-	 you don't need to write ``fromList [1, 2, 3]`` everywhere. Instead you
-	 can just write ``[1, 2, 3]`` and if the function is expecting a set it
-	 will be converted automatically! The code here will continue to use
-	 ``fromList`` for clarity though.
+	 <https://downloads.haskell.org/ghc/latest/docs/users_guide/exts/overloaded_lists.html>`_
+     extension so you don't need to write ``fromList [1, 2, 3]`` everywhere.
+     Instead you can just write ``[1, 2, 3]`` and if the function is
+     expecting a set it will be converted automatically! The code here
+     will continue to use ``fromList`` for clarity though.
 
 
 Importing Set and IntSet