The following text is found on http://www.apache.org/dev/release-download-pages.html#links (4th bullet in that section)
Artifacts which are not full official releases (for example, milestones, betas and alphas) may be linked from the download page. Links to these artifacts should be removed in a timely fashion. I believe it's missing a "not" and should be Artifacts which are not full official releases (for example, milestones, betas and alphas) may not be linked from the download page. Links to these artifacts should be removed in a timely fashion.
