Data collections in Sentinel Hub download notebook need some clarification

[azlinszkysinergise]

in sentinelhub/data_download_process_request Exaple 5, we print the supported data collections. A long list is output which shows Landsat, Harmonized Landsat Sentinel, Modis among others. These data collections are not available in CDSE - but some additional ones such as Sentinel-2 Quarterly Mosaics are available (as BYOC-s) which are not visible here.
The request is to print the collections the sentinelhub-py package supports, but I think additional text would be needed in the MD (the existing note?) to clarify that this is not all available in CDSE. Something like

"
Note:

This is the list of collections supported by the Sentinel Hub Python Package. Not all of these are available in Copernicus Data Space Ecosystem. For more examples and information check the documentation about Sentinel Hub data collections.
"

[azlinszkysinergise]

change DEM request to this - to make sure it is clear which DEM we are using

dem_request = SentinelHubRequest(
    evalscript=evalscript_dem,
    input_data=[
        SentinelHubRequest.input_data(
            data_collection=DataCollection.DEM_COPERNICUS_30.define_from(
                "dem", service_url=config.sh_base_url
            ),
            time_interval=("2020-06-12", "2020-06-13"),
        )
    ],
    responses=[SentinelHubRequest.output_response("default", MimeType.TIFF)],
    bbox=tihany_bbox,
    size=tihany_size,
    config=config,

[azlinszkysinergise]

We should also add an example to download data directly to the user's disk bypassing Jupyter storage, using FileLink widget or the requests python library or some similar magic