API-Documentation: Add the Utils-library.

Fix API after doc template change.

src/libs/utils/fancylineedit.cpp

@@ -46,6 +46,19 @@
 #include <QtGui/QStyle>
 #include <QtGui/QPaintEvent>
 
+/*!
+    \class Utils::FancyLineEdit
+
+    \brief A line edit with an embedded pixmap on one side that is connected to
+    a menu.
+
+    Additionally, it can display a grayed hintText (like "Type Here to")
+    when not focused and empty. When connecting to the changed signals and
+    querying text, one has to be aware that the text is set to that hint
+    text if isShowingHintText() returns true (that is, does not contain
+    valid user input).
+ */
+
 enum { margin = 6 };
 
 #define ICONBUTTON_HEIGHT 18