doc: describe parallel decode and trace stitching
doc: describe parallel decode and trace stitching

Change-Id: Ib458bb7e24d46bff67b7c45c87aee5b185832874
Signed-off-by: Markus Metzger <5f675b2b36595f90898e014b548ff7d9bbff2ab7@intel.com>

01org/processor-trace,01org/processor-trace,01org/processor-trace