### What problem does this PR solve?
Related source file is in Windows/DOS format, they are format to Unix
format.
### Type of change
- [x] Refactoring
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
File rag/svr/discord_svr.py is for discord bot.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)