Add upload file by knowledge base name API. (#539)
### What problem does this PR solve?
Add upload file by knowledge base name API.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update
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Co-authored-by: chrysanthemum-boy <fannc@qq.com>
Fixed a spelling error：
save -> safe
### What problem does this PR solve?
Fixed a spelling error：
save -> safe
### Type of change
- [x] Documentation Update
chrysanthemum-boy
Selfuppen
KevinHuSh