hide internal namespace in documentation

Point_set_processing_3/include/CGAL/poisson_eliminate.h

@@ -28,6 +28,8 @@
 
 namespace CGAL {
 
+#ifndef DOXYGEN_RUNNING
+
 namespace poisson_eliminate_impl {
 
 double get_maximum_radius(std::size_t dimension, std::size_t sample_size, double domain_size) {
@@ -212,6 +214,8 @@ struct Search_traits<Point, 3> : public CGAL::Search_traits_3<typename CGAL::Ker
 
 }
 
+#endif
+
 /**
    \ingroup PkgPointSetProcessing3Algorithms
    performs Poisson disk elimination with a desired output size. A greedy method that calculates a weight based on the