refactor(notebook): remove redundant kernel restart instructions

- Remove duplicate kernel restart guidance from kernel registration step
- Detailed instructions are already provided in IMPORTANT NEXT STEP section
- Reduces redundancy and improves notebook clarity

Author: T-DevH

notebooks/setup/complete_setup_guide.ipynb

@@ -633,8 +633,6 @@
     "        success, stdout, stderr = run_command([str(python_path), \"-m\", \"ipykernel\", \"install\", \"--user\", \"--name=warehouse-assistant\"])\n",
     "        if success:\n",
     "            print(\"✅ Kernel 'warehouse-assistant' registered!\")\n",
-    "            print(\"\\n⚠️  IMPORTANT: Please restart the kernel and select 'warehouse-assistant'\")\n",
-    "            print(\"   Go to: Kernel → Restart Kernel → Change Kernel → warehouse-assistant\")\n",
     "        else:\n",
     "            print(f\"⚠️  Could not register kernel: {stderr}\")\n",
     "            print(\"   You can do this manually later\")\n",