13 more auto manuals added

13 more auto manuals and guides were added recently, for the following brands:

Chevrolet:
   - 3 owner's manuals
   - 1 dealer order guide

Dodge:
   - 1 owner's manual

Lexus:
   - 3 warranty and services guides

Nissan:
   - 2 owner's manuals
   - 1 navigation system manual
   - 2 quick reference guides