cp info/man page: cp -p add: 'often must be root to preserve owner'

[Dan Jacobson]

The cp info/man page or its footnote needs to add a note saying that the
owner etc. won't be preserved if you're not root on many systems,

`-p'
`--preserve'
     Preserve the original files' owner, group, permissions, and
     timestamps.  In the absence of this option, each destination file
     is created with the permissions of the corresponding source file,
     minus the bits set in the umask. *Note File permissions::.
cp (GNU fileutils) 4.0p
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