vixie crontab(5) man page does not mention @reboot

[rbrewer123]

Describe the bug The man page for vixie cron's crontab format in nixos 19.03 does not mention the @reboot frequency directive, even though cron supports it.

To Reproduce Steps to reproduce the behavior:

1. man 5 crontab
2. Search for reboot
3. Nothing found

Expected behavior The man page should document @reboot and any other @ frequency directives that are supported by the underlying cron.

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module:
- cron

cc @aanderse

[aanderse]

Another upstream "bug". Generally we don't like to fix upstream bugs in the nixpkgs repo... but we're not going to see another release of cron so I guess we have to do something.

Taking a quick peak at Debian it seems they have modified the man pages themselves. I suppose we could just grab their man pages and ship that. heavily modified the man pages themselves, so I wouldn't want to just replace upstream man pages with theirs...

[rbrewer123]

@aanderse A small patch to the man page sounds fine to me. I'd like to combine it with the PR for #70562.

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