doc: mention navigatable error overlays

Author: deepfire

doc/haskell-mode.texi

@@ -536,6 +536,8 @@ Separate sessions per Cabal project @file{haskell-session.el}.
 A new inferior Haskell process handling code @file{haskell-process.el}.
 @item
 New REPL implementation similiar to SLIME/IELM
+@item
+Navigatable error overlays
 @file{haskell-interactive-mode.el}.
 @end itemize
 
@@ -553,6 +555,8 @@ keybindings in the @code{haskell-mode-map} keymap with the respective
     (define-key haskell-mode-map (kbd "C-c C-b") 'haskell-interactive-switch)
     (define-key haskell-mode-map (kbd "C-c C-t") 'haskell-process-do-type)
     (define-key haskell-mode-map (kbd "C-c C-i") 'haskell-process-do-info)
+    (define-key haskell-mode-map (kbd "M-p")     'haskell-goto-prev-error)
+    (define-key haskell-mode-map (kbd "M-n")     'haskell-goto-next-error)
     (define-key haskell-mode-map (kbd "C-c M-.") nil)
     (define-key haskell-mode-map (kbd "C-c C-d") nil)))
 @end lisp