[gtkmm-documentation] Adapt for AssistantPageType as Assistant::PageType.

[Murray Cumming <murrayc src gnome org>]

commit 97d57798360629129e2e0bf16b1b83cfb1cf7432
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed May 3 09:34:11 2017 +0200

    Adapt for AssistantPageType as Assistant::PageType.

 examples/book/assistant/exampleassistant.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/examples/book/assistant/exampleassistant.cc b/examples/book/assistant/exampleassistant.cc
index c7f2a99..0c2bdfd 100644
--- a/examples/book/assistant/exampleassistant.cc
+++ b/examples/book/assistant/exampleassistant.cc
@@ -40,8 +40,8 @@ ExampleAssistant::ExampleAssistant()
   set_page_complete(m_check, true);
   set_page_complete(m_label2, true);
 
-  set_page_type(m_box, Gtk::AssistantPageType::INTRO);
-  set_page_type(m_label2, Gtk::AssistantPageType::CONFIRM);
+  set_page_type(m_box, Gtk::Assistant::PageType::INTRO);
+  set_page_type(m_label2, Gtk::Assistant::PageType::CONFIRM);
 
   signal_apply().connect(sigc::mem_fun(*this,
     &ExampleAssistant::on_assistant_apply));