[docs] Suggestion for improvements

[Jari Aalto]

[Keep CC I'm not in list]

For page http://www.gnu.org/software/parted/manual/html_mono/parted.html
Please add more explanation (to manual pages as well) concerning these:

2.4.2 cp

    - Must the DEST partition be equal size?
    - What actually happens when FROM is smaller to DEST?
    - if DEST is maller than FROM, can parted copy only the DATA
      that is occupied in FROM and ignore rest?

      Like if FROM is 100M but only 30M used, and DEST is 50M