|   | 1 |  initial version  | 
This is a bug, fixed in https://trac.sagemath.org/ticket/33933. The command will be restored in the next release of SageMath. In the meantime, here is a workaround:
sage: from sage.misc.sagedoc import tutorial
sage: tutorial()
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.