docs: remove mention to nonexistent md

Signed-off-by: Hannah Zhang <hannahz@nvidia.com>

Author: hhzhang16

tests/planner/README.md

@@ -188,6 +188,4 @@ The main test scenario validates prefill scaling for H200 with 1P1D → 2P1D con
 - Kubernetes cluster with GPU nodes
 - kubectl configured and accessible
 - genai-perf available in PATH
-- Python dependencies installed
-
-For detailed configuration, troubleshooting, and architecture information, see [README_scaling_tests.md](README_scaling_tests.md).
+- Python dependencies installed