[devhelp] BookTree: change a FIXME comment

[Sébastien Wilmet <swilmet src gnome org>]

commit d016376ebb3759cff50d6513f43f37e63c332b56
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat May 19 12:53:21 2018 +0200

    BookTree: change a FIXME comment
    
    Have "DhLanguage" on the first line of the FIXME comment, so when doing
    a git grep we see that it's related to DhLanguage.

 devhelp/dh-book-tree.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/devhelp/dh-book-tree.c b/devhelp/dh-book-tree.c
index d1b17db..f9bad5c 100644
--- a/devhelp/dh-book-tree.c
+++ b/devhelp/dh-book-tree.c
@@ -136,9 +136,8 @@ book_tree_setup_selection (DhBookTree *tree)
  *  - Or the language group which should be just after our given language group.
  *  - Or both.
  *
- * FIXME: not great code. Maybe add a new column in the GtkTreeModel storing a
- * DhLanguage object. Instead of @language as a string, it would be a
- * DhLanguage.
+ * FIXME: not great code. Maybe have a DhLanguage object, and add a new column
+ * in the GtkTreeModel storing a DhLanguage object instead of a string.
  */
 static void
 book_tree_find_language_group (DhBookTree  *tree,