[gtkmm-documentation] Adapt to EntryIconPosition as Entry::IconPosition.

[Murray Cumming <murrayc src gnome org>]

commit e4a0f301441fdd75bbd912358f988ed9e8c55d21
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed May 3 09:58:52 2017 +0200

    Adapt to EntryIconPosition as Entry::IconPosition.

 examples/book/entry/icon/examplewindow.cc |    2 +-
 examples/book/entry/icon/examplewindow.h  |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/examples/book/entry/icon/examplewindow.cc b/examples/book/entry/icon/examplewindow.cc
index d990705..7c48523 100644
--- a/examples/book/entry/icon/examplewindow.cc
+++ b/examples/book/entry/icon/examplewindow.cc
@@ -44,7 +44,7 @@ ExampleWindow::~ExampleWindow()
 {
 }
 
-void ExampleWindow::on_icon_pressed(Gtk::EntryIconPosition /* icon_pos */, const GdkEventButton* /* event */)
+void ExampleWindow::on_icon_pressed(Gtk::Entry::IconPosition /* icon_pos */, const GdkEventButton* /* event 
*/)
 {
   std::cout << "Icon pressed." << std::endl;
 }
diff --git a/examples/book/entry/icon/examplewindow.h b/examples/book/entry/icon/examplewindow.h
index a90d2f2..64add92 100644
--- a/examples/book/entry/icon/examplewindow.h
+++ b/examples/book/entry/icon/examplewindow.h
@@ -29,7 +29,7 @@ public:
 
 protected:
   //Signal handlers:
-  void on_icon_pressed(Gtk::EntryIconPosition icon_pos, const GdkEventButton* event);
+  void on_icon_pressed(Gtk::Entry::IconPosition icon_pos, const GdkEventButton* event);
   void on_button_close();
 
   //Child widgets: