### What problem does this PR solve?
Update some docs and comments, since 'File manager' is rename to 'File'
### Type of change
- [x] Documentation Update
- [x] Refactoring
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Signed-off-by: Jin Hai <haijin.chn@gmail.com>
Co-authored-by: writinwaters <93570324+writinwaters@users.noreply.github.com>