message: Doc review: link on recent boost doc
diff: @@ -305,8 +305,8 @@ class Flag_complex_edge_collapser {
  /** \brief Inserts all edges given by a OneSkeletonGraph into a vector of
  * `Flag_complex_edge_collapser::Filtered_edge`.
  * OneSkeletonGraph must be a model of
  - * <a href="http://www.boost.org/doc/libs/1_65_1/libs/graph/doc/EdgeListGraph.html">boost::EdgeListGraph</a>
  - * and <a href="http://www.boost.org/doc/libs/1_65_1/libs/graph/doc/PropertyGraph.html">boost::PropertyGraph</a>.
  + * <a href="http://www.boost.org/doc/libs/1_73_0/libs/graph/doc/EdgeListGraph.html">boost::EdgeListGraph</a>
  + * and <a href="http://www.boost.org/doc/libs/1_73_0/libs/graph/doc/PropertyGraph.html">boost::PropertyGraph</a>.
  *
  * The edge filtration value is accessible through the property tag
  * edge_filtration_t.
  