Remove contradicting comment in docstring of `BaseModel.__get_pydanti…

…c_core_schema__` (#9448)

pydantic/main.py

@@ -610,8 +610,7 @@ def __get_pydantic_core_schema__(cls, source: type[BaseModel], handler: GetCoreS
         Args:
             source: The class we are generating a schema for.
                 This will generally be the same as the `cls` argument if this is a classmethod.
-            handler: Call into Pydantic's internal JSON schema generation.
-                A callable that calls into Pydantic's internal CoreSchema generation logic.
+            handler: A callable that calls into Pydantic's internal CoreSchema generation logic.
 
         Returns:
             A `pydantic-core` `CoreSchema`.