Remove non-existing argument from docstring (#128)

Author: kit1980

segment_anything_fast/modeling/image_encoder.py

@@ -346,7 +346,6 @@ def add_decomposed_rel_pos(
     Calculate decomposed Relative Positional Embeddings from :paper:`mvitv2`.
     https://github.com/facebookresearch/mvit/blob/19786631e330df9f3622e5402b4a419a263a2c80/mvit/models/attention.py   # noqa B950
     Args:
-        attn (Tensor): attention map.
         q (Tensor): query q in the attention layer with shape (B, q_h * q_w, C).
         rel_pos_h (Tensor): relative position embeddings (Lh, C) for height axis.
         rel_pos_w (Tensor): relative position embeddings (Lw, C) for width axis.