update leg joint settings

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

     spring: 0
     damper: 0
   m_AngularYLimit:
-    limit: 60
+    limit: 20
     bounciness: 0
     contactDistance: 0
   m_AngularZLimit:
     spring: 0
     damper: 0
   m_AngularYLimit:
-    limit: 60
+    limit: 20
     bounciness: 0
     contactDistance: 0
   m_AngularZLimit:
     spring: 0
     damper: 0
   m_AngularYLimit:
-    limit: 60
+    limit: 20
     bounciness: 0
     contactDistance: 0
   m_AngularZLimit:
     spring: 0
     damper: 0
   m_AngularYLimit:
-    limit: 60
+    limit: 20
     bounciness: 0
     contactDistance: 0
   m_AngularZLimit:

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

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 --- !u!1 &2095421678
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