SVN or Git?
I have searched the 'trees' at both the addresses you gave and cannot find the files for plural, either in code or in plain language. This doesn't matter as long as the projects which use CLDR or gettext plurals use their own downloads of the CLDR and gettext rules. If so it would perhaps be less confusing to remove the links to these files from the "plural" page anyway?
It's true that CLDR rules are not in our control (projects extract those themselves, usually via i18n framework), but the Gettext rules are authoritative and used like in that file.
Thanks, Nike. I have amended the plural page a little, and would be grateful if you could proofread, and amend where necessary, or get rid of ????? if the information is accurate, when you can fit this into your workload.