TODO doc for Gdk namespace.

There are in total 161 xml to document in Gdk. Right now there are 154 xml not documented in any proportion.
The idea is to have a easy way to know what documentation is missing, if you want to help or are helping please take out the xml that you commit
from the missing list. For documentation that take some time to finish (like HTML, TextBuffer, etc) the best is that you but your name and email
next to the file in this list to acknowledge that you are working in it (is recommendable that you suscribe to the mono-docs  mailing list).

Following is the list of undocumented xml:

AreaUpdatedArgs.xml
AreaUpdatedHandler.xml
AxisUse.xml
BRESINFO.xml
Bitmap.xml
ByteOrder.xml
CapStyle.xml
ClosedArgs.xml
ClosedHandler.xml
Color.xml
Colormap.xml
Colorspace.xml
CrossingMode.xml
Cursor.xml
CursorType.xml
DestroyNotify.xml
Device.xml
DeviceAxis.xml
DeviceKey.xml
Display.xml
DisplayManager.xml
DisplayOpenedArgs.xml
DisplayOpenedHandler.xml
DisplayPointerHooks.xml
Drag.xml
DragAction.xml
DragContext.xml
DragProtocol.xml
Drawable.xml
Drop.xml
EdgeTable.xml
EdgeTableEntry.xml
Error.xml
Event.xml
EventAny.xml
EventButton.xml
EventClient.xml
EventConfigure.xml
EventCrossing.xml
EventDND.xml
EventExpose.xml
EventFocus.xml
EventFunc.xml
EventHelper.xml
EventKey.xml
EventMask.xml
EventMotion.xml
EventNoExpose.xml
EventProperty.xml
EventProximity.xml
EventScroll.xml
EventSelection.xml
EventSetting.xml
EventType.xml
EventVisibility.xml
EventWindowState.xml
ExtensionMode.xml
Fill.xml
FillRule.xml
FilterFunc.xml
FilterReturn.xml
Font.xml
Function.xml
GCValues.xml
GCValuesMask.xml
Geometry.xml
Global.xml
GrabStatus.xml
Gravity.xml
Image.xml
ImageType.xml
InputCondition.xml
InputFunction.xml
InputMode.xml
InterpType.xml
JoinStyle.xml
Key.xml
Keyboard.xml
KeymapKey.xml
Keyval.xml
LineStyle.xml
ModifierType.xml
NotifyType.xml
OverlapType.xml
POINTBLOCK.xml
PangoAttrEmbossed.xml
PangoAttrStipple.xml
PangoHelper.xml
PixbufAlphaMode.xml
PixbufAniAnim.xml
PixbufAniAnimIter.xml
PixbufAnimation.xml
PixbufAnimationIter.xml
PixbufDestroyNotify.xml
PixbufError.xml
PixbufFormat.xml
PixbufFormatFlags.xml
PixbufFrame.xml
PixbufFrameAction.xml
PixbufGifAnim.xml
PixbufGifAnimIter.xml
PixbufLoader.xml
PixbufModule.xml
PixbufModuleFillInfoFunc.xml
PixbufModuleFillVtableFunc.xml
PixbufModulePattern.xml
PixbufModulePreparedFunc.xml
PixbufModuleSizeFunc.xml
PixbufModuleUpdatedFunc.xml
Pixdata.xml
PixdataDumpType.xml
PixdataType.xml
Pixmap.xml
Point.xml
Pointer.xml
PointerHooks.xml
PropMode.xml
Property.xml
PropertyState.xml
Query.xml
Rectangle.xml
Region.xml
RegionBox.xml
Rgb.xml
RgbCmap.xml
RgbDither.xml
ScanLineList.xml
ScanLineListBlock.xml
Screen.xml
ScrollDirection.xml
Segment.xml
Selection.xml
SettingAction.xml
SizePreparedArgs.xml
SizePreparedHandler.xml
Span.xml
SpanFunc.xml
Status.xml
SubwindowMode.xml
Text.xml
Threads.xml
TimeCoord.xml
VisibilityState.xml
WMDecoration.xml
WMFunction.xml
Window.xml
WindowAttr.xml
WindowAttributesType.xml
WindowClass.xml
WindowEdge.xml
WindowHints.xml
WindowState.xml
WindowType.xml
WindowTypeHint.xml