Remove note about unavailable streaming capability of the model (#1630)

Author: damyantilev

pydantic_ai_slim/pydantic_ai/models/anthropic.py

@@ -109,10 +109,6 @@ class AnthropicModel(Model):
     Internally, this uses the [Anthropic Python client](https://github.com/anthropics/anthropic-sdk-python) to interact with the API.
 
     Apart from `__init__`, all methods are private or match those of the base class.
-
-    !!! note
-        The `AnthropicModel` class does not yet support streaming responses.
-        We anticipate adding support for streaming responses in a near-term future release.
     """
 
     client: AsyncAnthropic = field(repr=False)