doc: remove link to "breaking changes" wiki

Breaking changes wiki is not updated, so removing the paragraph

PR-URL: https://github.com/nodejs/node/pull/19795


Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>