Remove experimental references from documentation.

doc/source/core/se/disc.rst

 Disc
 ====
 
-.. doxygenclass:: mln::experimental::se::disc
+.. doxygenclass:: mln::se::disc
    :members:
 
 

doc/source/core/se/mask2d.rst

 Mask 2D
 =======
 
-.. doxygenclass:: mln::se::experimental::mask2d
+.. doxygenclass:: mln::se::mask2d
    :members:

doc/source/core/se/periodic_lines.rst

 Periodic Line
 =============
 
-.. doxygenclass:: mln::experimental::se::periodic_line2d
+.. doxygenclass:: mln::se::periodic_line2d
    :members:
 
 

doc/source/core/se/rectangle.rst

@@ -4,7 +4,7 @@ Rectangle
 Include :file:`<mln/core/se/rect2d.hpp>`
 
 
-.. doxygenstruct:: mln::experimental::se::rect2d
+.. doxygenstruct:: mln::se::rect2d
    :members:
 
 

doc/source/labeling/cdt.rst

@@ -49,7 +49,7 @@ Example with the 5-7-11 weights::
     #include <mln/labeling/chamfer_distance_transform.hpp>
     #include <mln/core/se/mask2d.hpp>
 
-    auto weights = mln::se::experimental::wmask2d({{+0, 11, +0, 11, +0}, //
+    auto weights = mln::se::wmask2d({{+0, 11, +0, 11, +0}, //
                                                   {11, +7, +5, +7, 11},
                                                   {+0, +5, +0, +5, +0},
                                                   {11, +7, +5, +7, 11},

doc/source/morpho/component_tree.rst

@@ -311,7 +311,7 @@ The method will proceed as follows:
         struct my_accu_t : mln::Accumulator<my_accu_t>
          {
            using result_type   = my_accu_t;
-           using argument_type = mln::image_pixel_t<mln::experimental::image2d<uint8_t>>;
+           using argument_type = mln::image_pixel_t<mln::image2d<uint8_t>>;
 
            my_accu_t() = default;
 
@@ -341,7 +341,7 @@ The method will proceed as follows:
         };
 
         // Filter
-        t.filter(mln::morpho::experimental::CT_FILTER_DIRECT, node_map, pred);
+        t.filter(mln::morpho::CT_FILTER_DIRECT, node_map, pred);
 
 5. Reconstruct the image::