code: @Nonnull
    public BootstrapSpacingBuilder grid (@Nonnull final EBootstrapGridType eGrid)
    {
      ValueEnforcer.notNull (eGrid, "Grid");
      m_eGrid = eGrid;
      return this;
    }
docs: Set the grid type. Default is "xs" which means valid for all.
  
  @param eGrid
  Grid type. May not be <code>null</code>.
  @return this for chaining