Re: misc/58260: Adds the current policy on LLM generated code to the website

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

I already added it to this page (will be updated in an hour or two):

https://www.NetBSD.org/developers/commit-guidelines.html

 2. Do not commit tainted code to the repository.
 
    If you commit code that was not written by yourself, double check
    that the license on that code permits import into the NetBSD source
    repository, and permits free distribution. Check with the author(s)
    of the code, make sure that they were the sole author of the code
    and verify with them that they did not copy any other code.
 
+   Code generated by a large language model or similar technology,
+   such as such as GitHub/Microsoft's Copilot, OpenAI's ChatGPT, or
+   Facebook/Meta's Code Llama, is presumed to be tainted code, and
+   must not be committed without prior written approval by core.

I think it's a more obvious place for the text.

We should also add a note at https://www.NetBSD.org/contrib/ like
hgutch@ suggested, and at the gnats submission endpoints, for
user-facing contribution guidelines.