Fix minor goofage in previous doc updates:

 * The ETM dummy driver name is "dummy" not "etm_dummy";
   re-alphabetize.

 * DCC trace message mode "charmsg" is a format type
   (and what Linux needs)


git-svn-id: svn://svn.berlios.de/openocd/trunk@1976 b42882b7-edfa-0310-969c-e2dbd0fdcd60