docs: mark ARB_texture_storage_multisample done

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Brian Paul <brianp@vmware.com>

docs/GL3.txt

@@ -151,7 +151,7 @@ ARB_shader_storage_buffer_object                     not started
 ARB_stencil_texturing                                not started
 ARB_texture_buffer_range                             DONE (nv50, nvc0)
 ARB_texture_query_levels                             not started
-ARB_texture_storage_multisample                      not started
+ARB_texture_storage_multisample                      DONE (i965)
 ARB_texture_view                                     not started
 ARB_vertex_attrib_binding                            not started