docs: turn reminder to a note

docs/examples/emulator/robustgasp/plot_ppgasp.py

@@ -20,8 +20,7 @@ PPGaSP: GP emulation for multi-output functions
 # and :math:`\mathbf{y}=(y_1,\ldots,y_5)^T`.
 #
 # The training and testing data are provided in the folder '.../tests/data/'.
-# We first load the training and testing data. You may need to modify ``dir_data```
-# according to where you save them.
+# We first load the training and testing data. 
 
 import numpy as np
 import os
@@ -38,6 +37,10 @@ humanityXt = np.genfromtxt(os.path.join(dir_data, 'humanityXt.csv'), delimiter='
 humanityYt = np.genfromtxt(os.path.join(dir_data, 'humanityYt.csv'), delimiter=',')
 print(f"Number of testing data points: ", humanityXt.shape[0])
 
+# %% md
+# .. note:: You may need to modify ``dir_data`` according to where you save them
+#    on your local machine.
+
 # %% md
 # ``humanityX`` and ``humanitY`` are the training data, corresponding to ``design``
 # and ``response`` respectively. ``humanityXt`` are testing input data, at which