Fix docstring in DatasetDict::shuffle
{'login': 'felixdivo', 'id': 4403130, 'node_id': 'MDQ6VXNlcjQ0MDMxMzA=', 'avatar_url': 'https://avatars.githubusercontent.com/u/4403130?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/felixdivo', 'html_url': 'https://github.com/felixdivo', 'followers_url': 'https://api.github.com/users/felixdivo/followers', 'following_url': 'https://api.github.com/users/felixdivo/following{/other_user}', 'gists_url': 'https://api.github.com/users/felixdivo/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/felixdivo/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/felixdivo/subscriptions', 'organizations_url': 'https://api.github.com/users/felixdivo/orgs', 'repos_url': 'https://api.github.com/users/felixdivo/repos', 'events_url': 'https://api.github.com/users/felixdivo/events{/privacy}', 'received_events_url': 'https://api.github.com/users/felixdivo/received_events', 'type': 'User', 'site_admin': False}
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I think  due to #1626, the docstring contained this error ever since `seed` was added.
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