Remove `comm_gemm_overlap` doc (#1815)

Remove comm_gemm_overlap docs
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>

docs/api/c/comm_gemm_overlap.rst

-..
-    Copyright (c) 2022-2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
-
-    See LICENSE for license information.
-
-comm_gemm_overlap.h
-===================
-
-.. doxygenfile:: comm_gemm_overlap.h

docs/api/c/index.rst

@@ -16,7 +16,6 @@ directly from C/C++, without Python.
    activation.h <activation>
    cast_transpose_noop.h <cast_transpose_noop>
    cast.h <cast>
-   comm_gemm_overlap.h <comm_gemm_overlap>
    cudnn.h <cudnn>
    fused_attn.h <fused_attn>
    fused_rope.h <fused_rope>