In the new version of ReSharper (2016.x) is has been moved to the Code Style. ReSharper 2016.1.1

UPD1: for ReSharper 2017.x ReSharper 2017.1.2

UPD2: for ReSharper 2018.x ReSharper 2018.1

UPD3: for ReSharper 2019.x ReSharper 2019.1

UPD4: for ReSharper 2020.x enter image description here