API-Documentation: Add the Utils-library.

Fix API after doc template change.

src/libs/utils/checkablemessagebox.cpp

@@ -37,6 +37,16 @@
 #include <QtGui/QPushButton>
 #include <QtCore/QDebug>
 
+/*!
+    \class Utils::CheckableMessageBox
+
+     \brief A messagebox suitable for questions with a
+     "Do not ask me again" checkbox.
+
+    Emulates the QMessageBox API with
+    static conveniences. The message label can open external URLs.
+*/
+
 namespace Utils {
 
 struct CheckableMessageBoxPrivate {