Changes

Update electrical magnetic release notes of MSL 4.0.0 (#3469)

* Add release notes for SinCosResolver

* Add SwitchYD, AC/AC converter and circumferential flux models

* Variable amplutde and frequency sources

* Add rolling resistance and vehicle model

* Add source blocks

* Add homotopy of operational amplifier

* Write full sentences with full stop

* Comment on change of gyrator

* Subtrate of NPN and PNP transistor

* Refs #3010: Fix bug in current equations of diode