doc: ‘guix time-machine’ can travel to v0.16.0.

This is a followup to a26bce55e6.

* doc/guix.texi (Invoking guix time-machine): Update reference to oldest
commit.

Change-Id: Iae3d751d4377de92481276f9f2f31128f85c23c4
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Ludovic Courtès 2024-03-29 22:33:14 +01:00
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@ -5018,11 +5018,11 @@ opens the door to security vulnerabilities. @xref{Invoking guix pull,
@option{--allow-downgrades}}.
@end quotation
Due to @command{guix time-machine} relying on the ``inferiors''
mechanism (@pxref{Inferiors}), the oldest commit it can travel to is
commit @samp{6298c3ff} (``v1.0.0''), dated May 1@sup{st}, 2019, which is
the first release that included the inferiors mechanism. An error is
returned when attempting to navigate to older commits.
@c Keep this paragraph in sync with 'time-machine.scm'.
@command{guix time-machine} raises an error when attempting to travel to
commits older than ``v0.16.0'' (commit @samp{4a0b87f0}), dated
Dec.@: 2018. This is one of the oldest commits supporting the channel
mechanism that makes ``time travel'' possible.
@quotation Note
Although it should technically be possible to travel to such an old