[docs] Fix wpilibj JavaDoc warnings (#6154)

wpilibc/src/main/native/include/frc/drive/RobotDriveBase.h

@@ -77,14 +77,23 @@ class RobotDriveBase : public MotorSafety {
   std::string GetDescription() const override = 0;
 
  protected:
+  /// Default input deadband.
+  static constexpr double kDefaultDeadband = 0.02;
+
+  /// Default maximum output.
+  static constexpr double kDefaultMaxOutput = 1.0;
+
   /**
    * Renormalize all wheel speeds if the magnitude of any wheel is greater than
    * 1.0.
    */
   static void Desaturate(std::span<double> wheelSpeeds);
 
-  double m_deadband = 0.02;
-  double m_maxOutput = 1.0;
+  /// Input deadband.
+  double m_deadband = kDefaultDeadband;
+
+  /// Maximum output.
+  double m_maxOutput = kDefaultMaxOutput;
 };
 
 }  // namespace frc