chore: Updates model_config docstring to explicitly mentioning pydantic.

This is to disambiguate between pydantic model and LLM.

PiperOrigin-RevId: 754981617

src/google/adk/agents/active_streaming_tool.py

@@ -30,6 +30,7 @@ class ActiveStreamingTool(BaseModel):
       arbitrary_types_allowed=True,
       extra='forbid',
   )
+  """The pydantic model config."""
 
   task: Optional[asyncio.Task] = None
   """The active task of this streaming tool."""

src/google/adk/agents/base_agent.py

@@ -50,6 +50,7 @@ class BaseAgent(BaseModel):
       arbitrary_types_allowed=True,
       extra='forbid',
   )
+  """The pydantic model config."""
 
   name: str
   """The agent's name.

src/google/adk/agents/invocation_context.py

@@ -110,6 +110,7 @@ class InvocationContext(BaseModel):
       arbitrary_types_allowed=True,
       extra="forbid",
   )
+  """The pydantic model config."""
 
   artifact_service: Optional[BaseArtifactService] = None
   session_service: BaseSessionService

src/google/adk/agents/langgraph_agent.py

@@ -53,6 +53,7 @@ class LangGraphAgent(BaseAgent):
   model_config = ConfigDict(
       arbitrary_types_allowed=True,
   )
+  """The pydantic model config."""
 
   graph: CompiledGraph
 

src/google/adk/agents/live_request_queue.py

@@ -24,6 +24,7 @@ class LiveRequest(BaseModel):
   """Request send to live agents."""
 
   model_config = ConfigDict(ser_json_bytes='base64', val_json_bytes='base64')
+  """The pydantic model config."""
 
   content: Optional[types.Content] = None
   """If set, send the content to the model in turn-by-turn mode."""

src/google/adk/agents/run_config.py

@@ -37,6 +37,7 @@ class RunConfig(BaseModel):
   model_config = ConfigDict(
       extra='forbid',
   )
+  """The pydantic model config."""
 
   speech_config: Optional[types.SpeechConfig] = None
   """Speech configuration for the live agent."""

src/google/adk/agents/transcription_entry.py

@@ -26,6 +26,7 @@ class TranscriptionEntry(BaseModel):
       arbitrary_types_allowed=True,
       extra='forbid',
   )
+  """The pydantic model config."""
 
   role: str
   """The role that created this data, typically "user" or "model"""