Fix typo in FP4 quantize (#4933)

Summary:
X-link: facebookresearch/FBGEMM#1956

Pull Request resolved: #4933

as title

Differential Revision: D83083612

fbshipit-source-id: 8c6b065f05f1b202e1fd7b3746565c00e6b1d0bd

Author: cthi

fbgemm_gpu/experimental/gemm/triton_gemm/fp4_quantize.py

@@ -1461,7 +1461,7 @@ def triton_scale_nvfp4_quant(
         stochastic_casting (bool): Whether to use stochastic casting.
 
     Returns:
-        torch.Tensor: [M / 2] nvfp4 scaled tensor packed into in8
+        torch.Tensor: [M / 2] nvfp4 scaled tensor packed into int8
         torch.Tensor: [M / group_size] nvfp4 shared exponents into int8
 
         eg.