laravel/docs — pull request #6 by Kindari (2013-01-10 20:23:46+00:00)
Title: Update change in Set Mutator syntax

As per this commit and its discussion https://github.com/illuminate/database/commit/be7246d44f4667e27a196cbf91225f758b862004#L0R916 and then this issue, https://github.com/illuminate/database/issues/107 the syntax for mutators has changed.