docs: update referenced freebsd version

[ghost]

Fixes: #5942

[ThomasWaldmann]

no, we can't do it like that:

• changes.rst should be readable in source form also, so there is no placeholder expansion
• entries in changes.rst (esp. older ones) are not supposed to change (when updating the placeholder definition)

[ghost]

Hmm OK, I'll redo it.

[ghost]

OK if I understood correctly, all I needed to do was revert the changes to the changelog. Couldn't find any other instances that needed to be updated.

[ThomasWaldmann]

Thanks!

[ThomasWaldmann]

Can you check same for 1.1-maint (binary build OS versions see Vagrantfile there)?