[annotations] Add allow-none
This commit was created using a script that searched for all docstrings containing a parameter and the string 'or %NULL'. Gdk backends and demos excluded as they are not part of a public API https://bugzilla.gnome.org/show_bug.cgi?id=610474
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		| @ -170,8 +170,8 @@ gtk_tree_sortable_set_sort_column_id (GtkTreeSortable  *sortable, | ||||
|  * @sortable: A #GtkTreeSortable | ||||
|  * @sort_column_id: the sort column id to set the function for | ||||
|  * @sort_func: The comparison function | ||||
|  * @user_data: User data to pass to @sort_func, or %NULL | ||||
|  * @destroy: Destroy notifier of @user_data, or %NULL | ||||
|  * @user_data: (allow-none): User data to pass to @sort_func, or %NULL | ||||
|  * @destroy: (allow-none): Destroy notifier of @user_data, or %NULL | ||||
|  *  | ||||
|  * Sets the comparison function used when sorting to be @sort_func. If the | ||||
|  * current sort column id of @sortable is the same as @sort_column_id, then  | ||||
| @ -202,8 +202,8 @@ gtk_tree_sortable_set_sort_func (GtkTreeSortable        *sortable, | ||||
|  * gtk_tree_sortable_set_default_sort_func: | ||||
|  * @sortable: A #GtkTreeSortable | ||||
|  * @sort_func: The comparison function | ||||
|  * @user_data: User data to pass to @sort_func, or %NULL | ||||
|  * @destroy: Destroy notifier of @user_data, or %NULL | ||||
|  * @user_data: (allow-none): User data to pass to @sort_func, or %NULL | ||||
|  * @destroy: (allow-none): Destroy notifier of @user_data, or %NULL | ||||
|  *  | ||||
|  * Sets the default comparison function used when sorting to be @sort_func.   | ||||
|  * If the current sort column id of @sortable is | ||||
|  | ||||
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	 Johan Dahlin
					Johan Dahlin