gdiplus: Fix a docheader typo, add some missed headers.

dlls/gdiplus/region.c

@@ -339,6 +339,9 @@ GpStatus WINGDIPAPI GdipCombineRegionRectI(GpRegion *region,
     return GdipCombineRegionRect(region, &rectf, mode);
 }
 
+/*****************************************************************************
+ * GdipCombineRegionRegion [GDIPLUS.@]
+ */
 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
         GpRegion *region2, CombineMode mode)
 {
@@ -544,6 +547,9 @@ GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect,
     return Ok;
 }
 
+/*****************************************************************************
+ * GdipCreateRegionRectI [GDIPLUS.@]
+ */
 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
         GpRegion **region)
 {
@@ -621,6 +627,9 @@ GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
     return stat;
 }
 
+/*****************************************************************************
+ * GdipDeleteRegion [GDIPLUS.@]
+ */
 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 {
     TRACE("%p\n", region);
@@ -799,7 +808,7 @@ static void write_element(const region_element* element, DWORD *buffer,
  *
  * RETURNS
  *  SUCCESS: Ok
- *  FAILURE: InvalidParamter
+ *  FAILURE: InvalidParameter
  *
  * NOTES
  *  The header contains the size, a checksum, a version string, and the number