Remove Chinese comments and fix function arguments errors (#12052)

### What problem does this PR solve?

As title

### Type of change

- [x] Refactoring

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

api/utils/api_utils.py

@@ -163,6 +163,7 @@ def validate_request(*args, **kwargs):
             if error_arguments:
                 error_string += "required argument values: {}".format(",".join(["{}={}".format(a[0], a[1]) for a in error_arguments]))
             return error_string
+        return None
 
     def wrapper(func):
         @wraps(func)
@@ -409,7 +410,7 @@ def get_parser_config(chunk_method, parser_config):
     if default_config is None:
         return deep_merge(base_defaults, parser_config)
 
-    # Ensure raptor and graphrag fields have default values if not provided
+    # Ensure raptor and graph_rag fields have default values if not provided
     merged_config = deep_merge(base_defaults, default_config)
     merged_config = deep_merge(merged_config, parser_config)