This patch fixes several typos in comments in exec.c:

            longet -> longer
       recommanded -> recommended
        ajustments -> adjustments
   inconsistancies -> inconsistencies
           phsical -> physical
       positionned -> positioned
       succesfully -> successfully
      regon_offset -> region_offset

and also:

      start_region -> start_addr

Signed-off-by: Stuart Brady <stuart.brady@gmail.com>