Refine documentation to better explain fast-provide and sweep provider working
together, and highlight the performance improvement.
Changelog:
- add fast-provide to sweep provider features list
- explain performance improvement: root CIDs discoverable in <1s vs 30+ seconds
- note this uses optimistic DHT operations (faster with sweep provider)
- simplify examples, point to --help for details
Config docs:
- fix: --fast-provide-roots should be --fast-provide-root (singular)
- clarify Import.FastProvideRoot focuses on root CIDs while sweep handles all blocks
- simplify Import.FastProvideWait description
Command help:
- ipfs add: explain sweep provider context upfront
- ipfs dag import: add fast-provide explanation section
- both explain the split: fast-provide for roots, sweep for all blocks
1b9cc82597