Merge "Update default image for n preview docs. Update tools resources." into mnc-mr-docs am: 0a957d5aa2
am: b33f36497d

* commit 'b33f36497dbc7265ee16323ee6c0281690ca3221':
  Update default image for n preview docs. Update tools resources.

Change-Id: I1ed7ac4ecf30538252d4b277b1baf93ec61e4835