Mention that the man-pages at man7.org are outdated

[sebastiancarlos]

The website is currently outdated. It shows an outdated version of man-pages (5.13, released in 2021). Could you add a note saying that on the homepage?

A related PR wants to mention that this Github mirror is outdated too.

[Artoria2e5]

The HTML is pretty good though -- way better than die, which always shows up first on Google. It's not ManKier or the fancy BSD semantic sites, but it's quite readable.

[sebastiancarlos]

I agree, but note that other websites like manned.org and ManKier have both good HTML and more up-to-date versions of the man-pages. Compare the versions on https://man7.org/linux/man-pages/man2/pipe.2.html and https://manned.org/pipe.2 or https://www.mankier.com/2/pipe