notices for CC0

[Ineiev]

Hello,

The page on copyright notices [0] says that every nontrivial file
should have copyright notices; however, FSF's recommendation
for software under CC0 [1] suggests that such packages technically
should contain no copyright notices.

"Information for Maintainers of GNU Software" does discuss public
domain texts [2], but it might be useful to add a reference to
that place in [0] (and even generalize the passage in [2] to apply
to CC0).

Thank you!

[0] https://www.gnu.org/prep/maintain/html_node/Copyright-Notices.html
[1] 
https://wiki.creativecommons.org/wiki/CC0_FAQ#May_I_apply_CC0_to_computer_software.3F_If_so.2C_is_there_a_recommended_implementation.3F
[2] 
https://www.gnu.org/prep/maintain/html_node/Non_002dFSF_002dCopyrighted-Package.html

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