fix comment of MakeBoundaryElements()
# @param toCopyAll - if true, the whole initial mesh will be copied into
# the new mesh else only boundary elements will be copied into the new mesh
# @param groups - groups of 2D elements to make boundary around
- # the new mesh else only boundary elements will be copied into the new mesh
# @retval tuple( long, mesh, groups )
# long - number of added boundary elements
# mesh - the mesh where elements were added to