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revlog: delete references to deleted nullid sentinel value

Authored by martinvonz.

Description

revlog: delete references to deleted nullid sentinel value

We stopped keeping the nullid in the index in 781b2720d2ac (index:
don't include nullid in len(), 2018-07-20). I forgot to update some
comments about it.

Differential Revision: https://phab.mercurial-scm.org/D7366