fixed add component menu paths

com.unity.perception/Runtime/GroundTruth/Labelers/JointLabel.cs

     /// Label to designate a custom joint/keypoint. These are needed to add body
     /// parts to a humanoid model that are not contained in its <see cref="Animator"/> <see cref="Avatar"/>
     /// </summary>
-    [AddComponentMenu("Perception/Joint Label")]
+    [AddComponentMenu("Perception/Labeling/Joint Label")]
     public class JointLabel : MonoBehaviour
     {
         /// <summary>

com.unity.perception/Runtime/GroundTruth/Labeling/Labeling.cs

     /// <summary>
     /// Defines a set of labels associated with the object and its descendants. A Labeling component will override any Labeling components on the object's ancestors.
     /// </summary>
-    [AddComponentMenu("Perception/Joint Label")]
+    [AddComponentMenu("Perception/Labeling/Labeling")]
     public class Labeling : MonoBehaviour
     {
         /// <summary>

com.unity.perception/Runtime/Randomization/Scenarios/FixedLengthScenario.cs

     /// <summary>
     /// A scenario that runs for a fixed number of frames during each iteration
     /// </summary>
-    [AddComponentMenu("Perception/Randomization/Scenarios/Fixed Length Scenario")]
+    [AddComponentMenu("Perception/Scenarios/Fixed Length Scenario")]
     [MovedFrom("UnityEngine.Experimental.Perception.Randomization.Scenarios")]
     public class FixedLengthScenario: UnitySimulationScenario<FixedLengthScenario.Constants>
     {