fix notebook

Author: bef-18

Diff for: docs/source/notebook_examples/example_POD_cylinder.ipynb

@@ -53,7 +53,7 @@
    "outputs": [],
    "source": [
     "## Parameters\n",
-    "DATAFILE = '../../../Examples/DATA/CYLINDER.h5'\n",
+    "DATAFILE = '../../../Testsuite/DATA/CYLINDER.h5'\n",
     "VARIABLE = 'VELOC'\n",
     "\n",
     "## Data loading\n",