[gtksourceview] SpaceDrawer: add docs about the implicit trailing newline

[Sébastien Wilmet <swilmet src gnome org>]

commit e8bf7b8dd898e03df1cd599d73368d341747c062
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Oct 20 17:45:14 2016 +0200

    SpaceDrawer: add docs about the implicit trailing newline
    
    It was only documented in the deprecated API.

 gtksourceview/gtksourcespacedrawer.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtksourceview/gtksourcespacedrawer.h b/gtksourceview/gtksourcespacedrawer.h
index c97e5db..7517a41 100644
--- a/gtksourceview/gtksourcespacedrawer.h
+++ b/gtksourceview/gtksourcespacedrawer.h
@@ -64,7 +64,9 @@ struct _GtkSourceSpaceDrawerClass
  * @GTK_SOURCE_SPACE_TYPE_NONE: No flags.
  * @GTK_SOURCE_SPACE_TYPE_SPACE: Space character.
  * @GTK_SOURCE_SPACE_TYPE_TAB: Tab character.
- * @GTK_SOURCE_SPACE_TYPE_NEWLINE: Line break character.
+ * @GTK_SOURCE_SPACE_TYPE_NEWLINE: Line break character. If the
+ *   #GtkSourceBuffer:implicit-trailing-newline property is %TRUE,
+ *   #GtkSourceSpaceDrawer also draws a line break at the end of the buffer.
  * @GTK_SOURCE_SPACE_TYPE_NBSP: Non-breaking space character.
  * @GTK_SOURCE_SPACE_TYPE_ALL: All white spaces.
  *