Document Plausible on client requests page

This should have been a part of 8e07c26,
but better late than never.

Co-authored-by: James Hadfield <hadfield.james@gmail.com>

docs/customise-client/requests.rst

@@ -48,7 +48,7 @@ We use `Leaflet <https://leafletjs.com/>`__ to display the map tiles. There is o
 
 If a map is displayed by Auspice the individual tiles are requested from api.mapbox.com. Panning and zooming of the map result in futher requests for tiles. These are requested using our hardcoded access key, however this may change to a build-time-customisation in the future.
 
-Google Analytics (Optional)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Web Analytics (Optional)
+~~~~~~~~~~~~~~~~~~~~~~~~
 
-Auspice has the potential to include Google Analytics in a limited fashion. See :ref:`the client customisation API documentation <client-api-available-customisations>` for how to set this. Note that these requests are only made if you specify a Google Analytics key during build-time customisation of the client.
+Auspice has the potential to include either Plausible Analytics or Google Analytics in a limited fashion. See :ref:`the client customisation API documentation <client-api-available-customisations>` for how to set this. Note that these requests are only made if you set up build-time customisation of the client. (For nextstrain.org we use `Plausible analytics <https://github.com/nextstrain/nextstrain.org/blob/2685e6b363cf70808fa11ee38ac520dfb3a9cdc4/auspice-client/customisations/config.json#L14>`__.)