fix link in README (#3153)

sgl-kernel/developer_guide.md

@@ -26,7 +26,7 @@ Third-party libraries:
 Steps to add a new kernel:
 
 1. Implement in [src/sgl-kernel/csrc/](https://github.com/sgl-project/sglang/tree/main/sgl-kernel/src/sgl-kernel/csrc)
-2. Expose interface in [src/sgl-kernel/include/sgl_kernel_ops.h](https://github.com/sgl-project/sglang/blob/main/sgl-kernel/src/sgl-kernel/include/sgl_kernel_ops.h)
+2. Expose interface in [src/sgl-kernel/include/sgl_kernels_ops.h](https://github.com/sgl-project/sglang/blob/main/sgl-kernel/src/sgl-kernel/include/sgl_kernels_ops.h)
 3. Create torch extension in [src/sgl-kernel/torch_extension.cc](https://github.com/sgl-project/sglang/blob/main/sgl-kernel/src/sgl-kernel/torch_extension.cc)
 4. Create Python wrapper in [src/sgl-kernel/ops/\_\_init\_\_.py](https://github.com/sgl-project/sglang/blob/main/sgl-kernel/src/sgl-kernel/ops/__init__.py)
 5. Expose Python interface in [src/sgl-kernel/\_\_init\_\_.py](https://github.com/sgl-project/sglang/blob/main/sgl-kernel/src/sgl-kernel/__init__.py)

sgl-kernel/setup.py

@@ -88,7 +88,6 @@ sources = [
     "src/sgl-kernel/csrc/rotary_embedding.cu",
     "3rdparty/flashinfer/csrc/activation.cu",
     "3rdparty/flashinfer/csrc/bmm_fp8.cu",
-    "3rdparty/flashinfer/csrc/group_gemm.cu",
     "3rdparty/flashinfer/csrc/norm.cu",
     "3rdparty/flashinfer/csrc/sampling.cu",
     "3rdparty/flashinfer/csrc/renorm.cu",
@@ -103,7 +102,6 @@ sm_version = _get_device_sm()
 if torch.cuda.is_available():
     if cuda_version >= (12, 0) and sm_version >= 90:
         nvcc_flags.append("-gencode=arch=compute_90a,code=sm_90a")
-        sources.append("3rdparty/flashinfer/csrc/group_gemm_sm90.cu")
     if sm_version >= 90:
         nvcc_flags.extend(nvcc_flags_fp8)
     if sm_version >= 80:
@@ -112,7 +110,6 @@ else:
     # compilation environment without GPU
     if enable_sm90a:
         nvcc_flags.append("-gencode=arch=compute_90a,code=sm_90a")
-        sources.append("3rdparty/flashinfer/csrc/group_gemm_sm90.cu")
     if enable_fp8:
         nvcc_flags.extend(nvcc_flags_fp8)
     if enable_bf16: