47 more auto manuals added

47 more vehicle manuals and guides have been added recently:

Buick:
   - 7 owner’s manuals
   - 1 getting to know guide

Chevrolet:
   - 10 owner’s manuals

Dodge:
   - 1 owner’s manual

Ford:
   - 16 owner’s manuals
   - 2 owner’s manual supplements
   - 6 quick reference guides

Honda:
   - 1 online reference owner’s manual

Nissan:
   - 2 owner’s manuals
   - 1 quick reference guide