Minor typo in Changes

[Mats Bengtsson]

If you scroll to the bottom of 
https://lilypond.org/doc/v2.27/Documentation/changes/miscellaneous-improvements, 
you see the following line, which doesn't seem to have been updated for 
ages:

"For older news, go to 
https://lilypond.org/doc/v2.22/Documentation/changes/";

    /Mats