COPYRIGHT: Provide a better explanation of Rust copyrights
Avoid implying that any copyrights have been assigned to a separate entity (such as "The Rust Project Developers") Rust contributors retain their copyrights, and do not assign them to anyone by contributing. Remove the inaccurate notice, and provide a clear explanation. Avoid stating that all files contain copyright notices and/or license notices, and especially avoid suggesting that the license terms only apply to files marked as such. In the process, this also drops a separate notice that implies only some copyrights are retained by contributors (suggesting that others are not).
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