Spelling corrections (#7244)

Some spelling corrections.

Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_spherical_topology_traits_2_impl.h

@@ -215,16 +215,16 @@ is_in_face(const Face* f, const Point_2& p, const Vertex* v) const
 
     /*! We identify 2 main cases:
      * 1. The vertical ray intersects the boundary at a halfedge. In this
-     * case the x-possition of p is strictly larger than the x-possition of
-     * the current-curve source, and strictly smaller than x-possition of
+     * case the x-position of p is strictly larger than the x-position of
+     * the current-curve source, and strictly smaller than x-position of
      * the current-curve target, or vice versa.
      * 2. The vertical ray intersects the boundary at a vertex. In this case:
-     * a. the x-possition of p is strictly smaller than the x-position of the
+     * a. the x-position of p is strictly smaller than the x-position of the
      * current-curve source, and equal to the x-position of the current-curve
      * target, and
-     * b. the x-possition of p is equal to the x-position of the next-curve
+     * b. the x-position of p is equal to the x-position of the next-curve
      * source (not counting vertical curves in between), and strictly larger
-     * than the x-possition of the next-curve target, or vice verase (that is,
+     * than the x-position of the next-curve target, or vice verase (that is,
      * the "smaller" and "larger" interchanged).
      */
 

Documentation/doc/biblio/geom.bib

@@ -137313,7 +137313,7 @@ Contains C code."
 
 @inproceedings{ss-kaud-88
 , author =	"Th. Strothotte and J.-R. Sack"
-, title =	"Knowledge Aquisition using Diagrams"
+, title =	"Knowledge Acquisition using Diagrams"
 , booktitle =	"Proc. 3rd IFIP Conference on Man-Machine Systems"
 , site =	"Oulo, Finland"
 , year =	1988