fix mne datasets link

examples/plot_mne_example.py

@@ -49,7 +49,7 @@
 # First, we will load the example dataset from MNE, and have a quick look at the data.
 #
 # The MNE sample dataset is a combined MEG/EEG recording with an audiovisual task, as
-# described `here <https://mne.tools/stable/overview/datasets_index.html?#sample>`_.
+# described `here <https://mne.tools/stable/documentation/datasets.html>`_.
 #
 # For the current example, we are going to select only the EEG data,
 # and analyze it as continuous (non-epoched) data.