fix powgen notebook

Author: nvaytet

docs/user-guide/sns-instruments/POWGEN_data_reduction.ipynb

@@ -239,7 +239,7 @@
    "source": [
     "results = workflow.compute(\n",
     "    (\n",
-    "        TofDetector[SampleRun],\n",
+    "        WavelengthDetector[SampleRun],\n",
     "        CorrectedDetector[SampleRun],\n",
     "    )\n",
     ")"
@@ -252,7 +252,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "results[TofDetector[SampleRun]]"
+    "results[WavelengthDetector[SampleRun]]"
    ]
   },
   {
@@ -377,7 +377,8 @@
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3"
+   "pygments_lexer": "ipython3",
+   "version": "3.12.12"
   }
  },
  "nbformat": 4,