Kernel_23: unknown group in documentation

[albert-github]

Analogous to the issues #7691, #7692 and #7693 adding a warning to doxygen gives me the warning

Kernel_23/doc/Kernel_23/CGAL/intersections.h:14: warning: Found non-existing group 'do_intersect' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/intersections.h:81: warning: Found non-existing group 'intersection' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/Aff_transformation_2.h:88: warning: Found non-existing group 'kernel_affine' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/Aff_transformation_3.h:43: warning: Found non-existing group 'kernel_affine' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/aff_transformation_tags.h:18: warning: Found non-existing group 'kernel_affine' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/aff_transformation_tags.h:40: warning: Found non-existing group 'kernel_affine' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/aff_transformation_tags.h:62: warning: Found non-existing group 'kernel_affine' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/aff_transformation_tags.h:84: warning: Found non-existing group 'kernel_affine' for the command '@ingroup', ignoring command
Kernel_23/doc/Kernel_23/CGAL/aff_transformation_tags.h:106: warning: Found non-existing group 'kernel_affine' for the command '@ingroup', ignoring command

• where do these \ingroup belong to or should the lines be removed?

[afabri]

I fixed kernel_affine in #7804

[albert-github]

• The do_intersect might be do_intersect_grp see just a few lines up in Kernel_23/doc/Kernel_23/CGAL/intersections.h
• The intersect might be intersect_grp see just a few lines up in Kernel_23/doc/Kernel_23/CGAL/intersections.h

[albert-github]

This issue is only relevant when using the doxygen master version and as the CGAL versions 5.5. and 5.6 don't use this version in the distribution it is not relevant here.
With the current CGAL master and using the doxygen master version the warnings are gone based on the fix #7804.

I think the issue can be closed