[gtk+] Document text handle styling

[Matthias Clasen <matthiasc src gnome org>]

commit 0a136004c935f7dbce36bbfae643dadf17b5fe52
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 9 23:45:29 2015 -0500

    Document text handle styling
    
    Since GtkTextHandle is private, document text handle style
    classes in the GtkEntry and GtkTextView documentation.

 gtk/gtkentry.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkentry.c b/gtk/gtkentry.c
index e5d3886..fba26f8 100644
--- a/gtk/gtkentry.c
+++ b/gtk/gtkentry.c
@@ -132,6 +132,12 @@
  *
  * When the entry shows progress, it adds a subnode with the name progress.
  * The node has the style class .pulse when the shown progress is pulsing.
+ *
+ * When touch is used and touch selection handles are shown, they are using
+ * CSS nodes with name cursor-handle. They get the .top or .bottom style class
+ * depending on where they are shown in relation to the selection. If there is
+ * just a single handle for the text cursor, it gets the style class
+ * .insertion-cursor.
  */