Merge "Update default image for n preview docs. Update tools resources." into...

Merge "Update default image for n preview docs. Update tools resources." into mnc-mr-docs am: 0a957d5a am: b33f3649 am: a4101e66 am: de84a278 am: 14ecfb69
am: cb96b76a

* commit 'cb96b76a':
  Update default image for n preview docs. Update tools resources.

Change-Id: I7615339e978a2f9f46b178faf84b9f06034c28c1