[gtkmm-documentation] Minor corrections to stderr output.

[Murray Cumming <murrayc src gnome org>]

commit 7618f91fffdb934ff4cc9ea53a7c2d15667901f2
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Feb 11 10:56:47 2015 +0100

    Minor corrections to stderr output.

 examples/others/calendar/calendar.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/examples/others/calendar/calendar.cc b/examples/others/calendar/calendar.cc
index f49708a..3f71599 100644
--- a/examples/others/calendar/calendar.cc
+++ b/examples/others/calendar/calendar.cc
@@ -128,12 +128,12 @@ void CalendarExample::on_font_button_font_set()
   }
   catch (const Gtk::CssProviderError& ex)
   {
-    std::cerr << "CssProviderError, Gtk::CssProvider::load_from_path() failed: "
+    std::cerr << "CssProviderError, Gtk::CssProvider::load_from_data() failed: "
               << ex.what() << std::endl;
   }
   catch (const Glib::Error& ex)
   {
-    std::cerr << "Error, Gtk::CssProvider::load_from_path() failed: "
+    std::cerr << "Error, Gtk::CssProvider::load_from_data() failed: "
               << ex.what() << std::endl;
   }
 }