Draft: add modules of draftgeoutils to the proper Doxygen group

This includes `arcs`, `circle_inversion`, `circles`, `circles_apollonius`,
`circles_incomplete`, `cuboids`, `edges`, `faces`, `fillets`,
`general`, `geometry`, `intersections`, `linear_geometry`,
`offsets`, `sort_edges`, `wires`.

These are added to the `draftgeoutils` Doxygen group so that
the functions contained in each module are listed appropriately
in the automatically generated documentation.

src/Mod/Draft/draftgeoutils/intersections.py

@@ -21,10 +21,10 @@
 # *   USA                                                                   *
 # *                                                                         *
 # ***************************************************************************
-"""Provides basic functions for calculating intersections of shapes."""
+"""Provides various functions to calculate intersections of shapes."""
 ## @package intersections
-# \ingroup DRAFTGEOUTILS
-# \brief Provides basic functions for calculating intersections of shapes.
+# \ingroup draftgeoutils
+# \brief Provides various functions to calculate intersections of shapes.
 
 import lazy_loader.lazy_loader as lz
 
@@ -37,6 +37,9 @@ from draftgeoutils.edges import findMidpoint
 # Delay import of module until first use because it is heavy
 Part = lz.LazyLoader("Part", globals(), "Part")
 
+## \addtogroup draftgeoutils
+# @{
+
 
 def findIntersection(edge1, edge2,
                      infinite1=False, infinite2=False,
@@ -411,3 +414,5 @@ def angleBisection(edge1, edge2):
         direction.normalize()
 
     return Part.LineSegment(origin, origin.add(direction)).toShape()
+
+## @}