Various minor tweaks for the User's guide.

 - Fix various minor (but repeated) typographic goofs;
 - Talk about TAP "declaration" not "creation" (they exist
   even if OpenOCD never learns about their board);
 - Encourage board.cfg for reset config, not target.cfg
 - Fill in some missing information (e.g. x16_as_x8)
 - Add a cross reference to the FAQ on TAP ordering;
 - Unclutter the concept index a bit (re core-specific commands)
 - Provide a bit more info about TAP states


git-svn-id: svn://svn.berlios.de/openocd/trunk@2096 b42882b7-edfa-0310-969c-e2dbd0fdcd60