Fix typo in code (#8327)

### What problem does this PR solve?

Fix typo in code

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/ragflow_server.py

@@ -18,9 +18,9 @@
 # from beartype.claw import beartype_all  # <-- you didn't sign up for this
 # beartype_all(conf=BeartypeConf(violation_type=UserWarning))    # <-- emit warnings from all code
 
-from api.utils.log_utils import initRootLogger
+from api.utils.log_utils import init_root_logger
 from plugin import GlobalPluginManager
-initRootLogger("ragflow_server")
+init_root_logger("ragflow_server")
 
 import logging
 import os