fix javadoc warnings/errors

Change-Id: I079699631185f986952bbf4cbb23661f9f9d123d

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/fixtures/AnalogCrossConnectFixture.java

@@ -70,7 +70,7 @@ public abstract class AnalogCrossConnectFixture implements ITestFixture {
   }
 
   /**
-   * @return
+   * @return Analog Output
    */
   final public AnalogOutput getOutput() {
     initialize();

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/fixtures/MotorEncoderFixture.java

@@ -51,7 +51,7 @@ public abstract class MotorEncoderFixture<T extends SpeedController> implements
    * Constructor should only be called from outside this class if the Speed
    * controller is not also an implementation of PWM interface
    *$
-   * @return
+   * @return SpeedController
    */
   abstract protected T giveSpeedController();
 
@@ -59,7 +59,7 @@ public abstract class MotorEncoderFixture<T extends SpeedController> implements
    * Where the implementer of this class should pass one of the digital inputs<br>
    * CONSTRUCTOR SHOULD NOT BE CALLED FROM OUTSIDE THIS CLASS!
    *$
-   * @return
+   * @return DigitalInput
    */
   abstract protected DigitalInput giveDigitalInputA();