- Revisit the head comments.

  * Since the last mods in TPostScript:Text, some pieces of documentation
    were wrong.
  * Some HTML reference (<A>) pointed to nothing.
  * The HTML formatting in the "Color Model" paragraph was wrong.
  * Cosmetic in comments.


git-svn-id: http://root.cern.ch/svn/root/trunk@17243 27541ba8-7e3a-0410-8455-c3a389f83636