Simplify ValidationError.from_exception_data() docstring (#1768)

Author: kinuax

python/pydantic_core/_pydantic_core.pyi

@@ -646,9 +646,6 @@ class ValidationError(ValueError):
         """
         Python constructor for a Validation Error.
 
-        The API for constructing validation errors will probably change in the future,
-        hence the static method rather than `__init__`.
-
         Arguments:
             title: The title of the error, as used in the heading of `str(validation_error)`
             line_errors: A list of [`InitErrorDetails`][pydantic_core.InitErrorDetails] which contain information