[doc/changelog] the removal of next_tabindex produce an error not in the changelog When one tried to migrate to 3.25, the error "class X initialization doesn't have a settabindex argument" can happen but the word "settabindex" is not present in the changelog which makes it hard to find to which modification this error is related.

cubicweb source: source-is-missing cubicweb/web/data/jquery.flot.js line length is * characters (>512)