doc: move simplex function from module

The function should be in GridGenerator...

diff --git a/include/deal.II/grid/grid_generator.h b/include/deal.II/grid/grid_generator.h
index 9747f51a85024bd2c8193b1d98ad784218fa9bad..5b66c3e21be1e28c29ee7ab323bb28a114ee513b 100644 (file)
--- a/include/deal.II/grid/grid_generator.h
+++ b/include/deal.II/grid/grid_generator.h
@@ -1792,7 +1792,7 @@ namespace GridGenerator
    *
    * @image html grid_generator_implicit_function_3d.png
    *
-   * @ingroup simplex
+   * @relates simplex
    *
    * @param[out] tria The output triangulation
    * @param[in] implicit_function The implicit function