update m2met2 doc & baseline (#675)

yhliang

2023-06-28 3cc7403b687e4c9832885df3caaea181894a512f

 funasr/models/frontend/abs_frontend.py

@@ -14,4 +14,4 @@
    def forward(
        self, input: torch.Tensor, input_lengths: torch.Tensor
    ) -> Tuple[torch.Tensor, torch.Tensor]:
        raise NotImplementedError
        raise NotImplementedError