update prefabs

Project/Assets/ML-Agents/Examples/Crawler/Prefabs/DynamicPlatform.prefab

   m_Modification:
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     m_Modifications:
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-      objectReference: {fileID: 0}
-    - target: {fileID: 4845971001715176648, guid: 0456c89e8c9c243d595b039fe7aa0bf9,
-        type: 3}
-      propertyPath: m_Model
-      value: 
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-        type: 3}
-    - target: {fileID: 4845971001715176649, guid: 0456c89e8c9c243d595b039fe7aa0bf9,
-        type: 3}
-      propertyPath: target
-      value: 
-      objectReference: {fileID: 0}
-    - target: {fileID: 4845971001715176649, guid: 0456c89e8c9c243d595b039fe7aa0bf9,
-        type: 3}
-      propertyPath: typeOfCrawler
-      value: 0
-      objectReference: {fileID: 0}
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       propertyPath: m_LocalPosition.x

Project/Assets/ML-Agents/Examples/Crawler/Prefabs/Ragdoll/CrawlerBase.prefab

   crawlerDyVSBrain: {fileID: 11400000, guid: da8f1c85e82404cab8589620d180010f, type: 3}
   crawlerStBrain: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870, type: 3}
   crawlerStVSBrain: {fileID: 11400000, guid: b409c2ae05d2e454ca8dbd8dbbfc15da, type: 3}
-  m_TargetWalkingSpeed: 10
+  m_TargetWalkingSpeed: 15
   randomizeWalkSpeedEachEpisode: 0
   targetPrefab: {fileID: 3839136118347789758, guid: 1a2a52e48911845a8a189e0891357ea2,
     type: 3}

Project/Assets/ML-Agents/Examples/Crawler/Scenes/CrawlerDynamicVariableSpeed.unity

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         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
     - target: {fileID: 4845971000278833189, guid: 0058b366f9d6d44a3ba35beb06b0174b,
         type: 3}
       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
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         type: 3}
       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
     - target: {fileID: 4845971000278833189, guid: 0058b366f9d6d44a3ba35beb06b0174b,
         type: 3}
       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
     - target: {fileID: 4845971000278833189, guid: 0058b366f9d6d44a3ba35beb06b0174b,
         type: 3}
       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
     - target: {fileID: 4845971000278833189, guid: 0058b366f9d6d44a3ba35beb06b0174b,
         type: 3}
       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
     - target: {fileID: 4845971000278833189, guid: 0058b366f9d6d44a3ba35beb06b0174b,
         type: 3}
       propertyPath: m_ConnectedAnchor.z
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
     - target: {fileID: 4845971000278833189, guid: 0058b366f9d6d44a3ba35beb06b0174b,
         type: 3}
       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
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       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
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+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
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       propertyPath: m_ConnectedAnchor.x
       value: 
       objectReference: {fileID: 11400000, guid: e4a120cf5c6c048a99d60cd948f08870,
         type: 3}
+    - target: {fileID: 3421283062001101770, guid: 0058b366f9d6d44a3ba35beb06b0174b,
+        type: 3}
+      propertyPath: m_TargetWalkingSpeed
+      value: 15
+      objectReference: {fileID: 0}
     - target: {fileID: 6810587057221831324, guid: 0058b366f9d6d44a3ba35beb06b0174b,
         type: 3}
       propertyPath: m_LocalPosition.x