Stale link on help pages

[bgstack15]

Summary

Describe your problem here links to https://github.com/minetest/contentdb/blob/master/docs/minetest_client.md but it should now point to https://github.com/luanti-org/contentdb/blob/master/docs/luanti_client.md

Steps to reproduce

Visit the page and try the stale link.

[nikhiln64]

I can take this up.