Update notebook_invalid_execution_order_noncompliant.ipynb

src/python/detectors/notebook_invalid_execution_order/notebook_invalid_execution_order_noncompliant.ipynb

@@ -16,7 +16,7 @@
    "outputs": [],
    "source": [
     "# {fact [email protected] defects=0}\n",
-    "# Noncompliant: execution order of cells is invalid.\n",
+    "# Noncompliant: execution order of cells is not linear. When executing cells in linear order, variables `x` and `y` are undefined before use.\n",
     "sum = x + y\n",
     "product = x * y\n",
     "exp = x ** y"