It will be very usefull to control the spacing (top and bottom) for a paragraph.
By default, all text generated (via addText function) has a spacing_top=0pt and spacing_bottom=10pt. At the moment, we can not change the values with PHPDOCX.
You may include in the $paragraphOptions array of the addText method the spacingTop and spacingBottom parameters.
Beware that they are given in twentieths of a point so if you want a top spacing of 20pt you have to set spacingTop to 400