Removing double words

[albert-github]

• removing double words
• correcting some texts

[albert-github]

Extending the fixes of @LOTUS9679

Some cases are not handled as it is unknown what to do:

Intersections_3/include/CGAL/Intersections_3/internal/Triangle_3_Triangle_3_intersection.h:147 // for each each on t1 on edge of the current intersection.

Arrangement_on_surface_2/doc/Arrangement_on_surface_2/Concepts/AosTopologyTraits.h:8  * it maintains the doubly-connected connected edge list (DCEL) used by the
Polygon_mesh_processing/examples/Polygon_mesh_processing/cc_compatible_orientations.cpp:21 // create a mesh with many connected connected components that should

[afabri]

I checked them all, and only have a doubt on template template which is probably correct

[sloriot]

Successfully tested in CGAL-6.2-Ic-82