stop a sphinx warning

Author: smartvinnetou

pandas/core/generic.py

@@ -6723,7 +6723,7 @@ def replace(
 
         downcast : optional, 'infer' or None, defaults to None
             Downcast dtypes if possible.
-        **kwargs
+        ``**kwargs``
             Keyword arguments to pass on to the interpolating function.
 
         Returns