[LAA] [ANN] jack_mixer version 16 released (corrected URL)

[Christopher Arndt]

Correction: the URL for the jack_mixer version 16 release on GitHub is:

    https://github.com/jack-mixer/jack_mixer/releases/tag/release-16

(There has to be at least one error in each announcement mail and
Murphy, apparently alive and well, stipulates that it probably occurs in
the part, which readers will actually read and click on.)