docs: remove incorrect Raises section from stream() docstring

The stream() function issues a deprecation warning via warnings.warn()
but doesn't raise an exception, so the Raises section was incorrect.

Author: zeke

src/replicate/lib/_stream.py

@@ -80,9 +80,6 @@ def stream(
     Returns:
         An iterator (or async iterator) that yields output strings as they are
         generated by the model
-
-    Raises:
-        DeprecationWarning: Always raised when this function is called
     """
     # Log deprecation warning with helpful migration example
     warnings.warn(