[Test] Consolidate kernel tests under plural kernels tree (#39966)

python/sglang/multimodal_gen/runtime/layers/attention/backends/subblock_sparse/README.md

@@ -191,7 +191,7 @@ are comparable.
 | `../subblock_sparse_attn.py` | the `AttentionBackend`: schedule, gating, dense fallback |
 
 Tests: `test/unit/test_subblock_sparse_attention.py` and
-`test/registered/kernel/attention/test_subblock_sage_fp8_sm90.py`. The GPU
+`test/registered/kernels/ops/attention/test_subblock_sage_fp8_sm90.py`. The GPU
 test covers the native production dispatch. Running at a full block budget must
 reproduce dense attention up to the expected quantization error, pinning routing
 indices, ragged tails, scale domains and the softmax scale in one check.

python/sglang/srt/distributed/device_communicators/configs/custom_all_reduce_v2.py

@@ -1,9 +1,9 @@
 """Hand-tuned dispatch configs for the JIT custom all-reduce (v2).
 
 Thresholds and block counts come from sweeps of
-``test/registered/jit/benchmark/bench_custom_all_reduce.py`` on the listed
-GPUs; ``get_all_reduce_config`` picks the table for the current arch and
-world size.
+``test/registered/kernels/benchmark/communication/bench_custom_all_reduce.py``
+on the listed GPUs; ``get_all_reduce_config`` picks the table for the current
+arch and world size.
 """
 
 from functools import cache