Add MotorControllerGroup and MotorController changes to changelog (#2507

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* Add MotorControllerGroup and MotorController changes

Fixes #2506

* Fix typo

Co-authored-by: Jason Daming <jason.daming@intralox.com>

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Co-authored-by: Jason Daming <jason.daming@intralox.com>

source/docs/yearly-overview/yearly-changelog.rst

@@ -109,6 +109,11 @@ General Library
 - ArcadeDrive: Fix max output handling
 - Add ``PWMSparkFlex`` Motor Controller
 - ADIS16470: allow accessing all three axes
+- Deprecated ``MotorControllerGroup``. Use ``PWMMotorController`` ``addFollower()`` method or if using CAN motor controllers use their method of following.
+- Added functional inteface to ``DifferentialDrive`` and ``MecanumDrive``. The ``MotorController`` interface may be removed in the future to reduce coupling with vendor libraries. Instead of passing ``MotorController`` objects, the following method references or lambda expressions can be used:
+
+    - Java: ``DifferentialDrive drive = new DifferentialDrive(m_leftMotor::set, m_rightMotor::set);``
+    - C++: ``frc::DifferentialDrive m_drive{[&](double output) { m_leftMotor.Set(output); }, [&](double output) { m_rightMotor.Set(output); }};``
 
 Breaking Changes
 ^^^^^^^^^^^^^^^^