chore: Remove redundant attribute descriptions from docstrings

The attributes are already defined as fields in the Pydantic models, making the docstring descriptions unnecessary.

PiperOrigin-RevId: 806091305

src/google/adk/models/base_llm.py

@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 from __future__ import annotations
 
 from abc import abstractmethod
@@ -29,11 +30,7 @@ if TYPE_CHECKING:
 
 
 class BaseLlm(BaseModel):
-  """The BaseLLM class.
-
-  Attributes:
-    model: The name of the LLM, e.g. gemini-2.5-flash or gemini-2.5-pro.
-  """
+  """The BaseLLM class."""
 
   model_config = ConfigDict(
       # This allows us to use arbitrary types in the model. E.g. PIL.Image.