More vacuum cleaner manuals added

More vacuum manuals for the following brands have been added over the past few days:

- Dyson: 2 vacuum manuals
- Nilfisk: 1 vacuum manual
- Samsung: 6 vacuum cleaner manuals, 1 vacuum service manual
- Sanitaire: 3 vacuum manuals, 1 vacuum parts manual
- Stihl: 1 vacuum manual