11 vacuum cleaner manuals and parts lists added

11 more vacuum cleaner manuals and parts lists have been added recently, for the following brands:

- Dirt Devil: 1 vacuum cleaner manual, 1 vacuum cleaner parts list
- Hoover: 2 vacuum cleaner parts lists
- Riccar: 4 vacuum cleaner manuals
- Shop-Vac: 3 vacuum cleaner parts lists