Docs: Adding AfW Test Harness page + nav
      Adding comments from CL and doc
      Changing platform variable to linux-86
      Changing linux-86 to linux-x86
      Adding editorial comments
      Adding new content for b/25790522
      Adding new comments

Bug: 30389619, 25790522

Change-Id: Ia48c25728af390957631cff2d096d776e5038c4f
4 files changed