Add pyre fixme for downstream type errors from D65753120

Summary:
X-link: meta-pytorch/captum#1439

X-link: facebook/Ax#3055

X-link: ctrl-labs/src2#38515

X-link: ctrl-labs/src2#38514

bypass-github-export-checks "The check is bugged, I exported all the required exports"

Reviewed By: jermenkoo

Differential Revision: D65826205

fbshipit-source-id: b08f00caaac8f3cc235bc280c4fe3f99089a0753

Author: ezyang

fbgemm_gpu/experimental/gemm/test/fp8_gemm_test.py

@@ -156,6 +156,8 @@ def _quantize_matmul_fp8(
 
             expected_result = a @ b.T
             if use_bias:
+                # pyre-fixme[6]: For 1st argument expected `Union[bool, complex,
+                #  float, int, Tensor]` but got `Optional[Tensor]`.
                 expected_result += bias
             self.assertTrue(
                 torch.allclose(result, expected_result, atol=2e-1, rtol=5e-2)