mn: report that this driver is removed in 14, not 13

(cherry picked from commit a66e75d9e2ddd9a84f8de204438282a25bb1a954)

mn: bump deprecation version to 14 in man page as well

Fixes: 66e75d9e2ddd ("mn: report that this driver is removed in 14, not 13")

(cherry picked from commit 6acecf247f60fcd3ba9662d54c59fc7bd46fb67a)

Approved by: re (gjb)