Documentation on readthedocs - links to older releases return 404 errors

[E R]

If you visit https://bind9.readthedocs.io/en/v9.18.15/ you will see a menu
in the lower left corner where you can select older releases of the bind
ARM manual.  But those links do not work and return a 404.  Should those
links work?  Or do they need to be removed?

In my case I visited https://kb.isc.org/docs/aa-01031 which pointed me to
the right location to get a PDF copy of other releases and pointed me to
the sources location where I can get the PDF that matches my distribution's
version.
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