Formatting fixes

Author: github-actions[bot]

wpimath/src/main/java/edu/wpi/first/math/system/plant/KnownDCMotor.java

@@ -1,3 +1,7 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
 package edu.wpi.first.math.system.plant;
 
 import static edu.wpi.first.units.Units.Amps;