More replacement in the doc of \R by \mathbb{R}

Triangulation_3/doc/Triangulation_3/CGAL/Regular_triangulation_3.h

@@ -5,8 +5,8 @@ namespace CGAL {
 \ingroup PkgTriangulation3TriangulationClasses
 
 Let \f$ {S}^{(w)}\f$ be a set of weighted points in \f$ \mathbb{R}^3\f$. Let 
-\f$ {p}^{(w)}=(p,w_p), p\in\R^3, w_p\in\R\f$ and 
-\f$ {z}^{(w)}=(z,w_z), z\in\R^3, w_z\in\R\f$ be two weighted points. 
+\f$ {p}^{(w)}=(p,w_p), p\in\mathbb{R}^3, w_p\in\mathbb{R}\f$ and 
+\f$ {z}^{(w)}=(z,w_z), z\in\mathbb{R}^3, w_z\in\mathbb{R}\f$ be two weighted points. 
 A weighted point 
 \f$ {p}^{(w)}=(p,w_p)\f$ can also be seen as a sphere of center \f$ p\f$ and 
 radius \f$ \sqrt{w_p}\f$. 

Triangulation_3/doc/Triangulation_3/Concepts/RegularTriangulationTraits_3.h

@@ -50,7 +50,7 @@ typedef unspecified_type Ray_3;
 /*! \name
 We use here the same notation as in Section \ref
 Triangulation3secclassRegulartriangulation. To simplify notation, \f$
-p\f$ will often denote in the sequel either the point \f$ p\in\R^3\f$
+p\f$ will often denote in the sequel either the point \f$ p\in\mathbb{R}^3\f$
 or the weighted point \f$ {p}^{(w)}=(p,w_p)\f$.
 */
 /// @{

Triangulation_3/doc/Triangulation_3/Triangulation_3.txt

@@ -143,8 +143,8 @@ The class `Regular_triangulation_3` implements incremental regular
 triangulations, also known as weighted Delaunay triangulations.
 
 Let \f$ {S}^{(w)}\f$ be a set of weighted points in \f$ \mathbb{R}^3\f$. Let
-\f$ {p}^{(w)}=(p,w_p), p\in\R^3, w_p\in\R\f$ and 
-\f$ {z}^{(w)}=(z,w_z), z\in\R^3, w_z\in\R\f$ be two weighted points. 
+\f$ {p}^{(w)}=(p,w_p), p\in\mathbb{R}^3, w_p\in\mathbb{R}\f$ and 
+\f$ {z}^{(w)}=(z,w_z), z\in\mathbb{R}^3, w_z\in\mathbb{R}\f$ be two weighted points. 
 A weighted point
 \f$ {p}^{(w)}=(p,w_p)\f$ can also be seen as a sphere of center \f$ p\f$ and
 radius \f$ \sqrt{w_p}\f$.