docs(guide/migration): better describe what the BC in c054288c is about
Also, updated the corresponding entry in changelog. This came up in https://github.com/angular/angular.js/commit/c054288c9722875e3595e6e6162193e0fb67a251#commitcomment-14783993.
G
Georgios Kalpakas committed
b0e7d548d0ce560cd636435d7c466eeb8d40987c
Parent: e4bb838