note in docs somewhere that project AOI has max 10 features

[danbjoseph]

project admins should be informed somewhere that the project AOI can be a geojson file with multiple features but there is a limit of max 10 features. maybe just in the dashboard when creating a project? see https://github.com/mapswipe/python-mapswipe-workers/blob/f12a789e752acdd1c8134e6eb6e769496b540fcf/mapswipe_workers/mapswipe_workers/definitions.py#L21