Update verbiage in example notebook

notebooks/Specviz2dExample.ipynb

@@ -95,7 +95,7 @@
    "source": [
     "## Re-extract the spectrum\n",
     "\n",
-    "In cases where default extraction fails (you do not see extracted 1D spectrum shown in the bottom viewer), you can opt to re-extract using \"Spectral Extraction\" plugin. If you prefer using its API, you can do it as follows. If your new inputs result in a successful extraction, a valid 1D spectrum would now appear in the bottom viewer."
+    "In cases where you wish to fine-tune the default extraction, you can opt to re-extract using \"Spectral Extraction\" plugin. If you prefer using its API, you can do it as follows. If your new inputs result in a successful extraction, a valid 1D spectrum would now appear in the bottom viewer."
    ]
   },
   {