[scene] Update scene spaces and doc

Author: epernod

scenes/elephant_skeleton.scn

@@ -1,5 +1,5 @@
 <Node name="root" dt="0.01" gravity="0 -1 0">
-	<VisualStyle displayFlags="showVisual showCollisionModels showWireframe"/>
+    <VisualStyle displayFlags="showVisual showCollisionModels showWireframe"/>
     <RequiredPlugin name="Sofa.GL.Component.Rendering3D"/> <!-- Needed to use components [OglModel] -->
     <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->
     <RequiredPlugin name="Sofa.Component.SceneUtility"/> <!-- Needed to use components [InfoComponent] -->
@@ -17,5 +17,5 @@
     <Node name="visual">
         <OglModel src="@../meshLoader"/>
     </Node>
-	
-</Node>
+    
+</Node>

scenes/raptor_skeleton.scn

@@ -1,5 +1,5 @@
 <Node name="root" dt="0.01" gravity="0 -1 0">
-	<VisualStyle displayFlags="showVisual showCollisionModels showWireframe"/>
+    <VisualStyle displayFlags="showVisual showCollisionModels showWireframe"/>
     <RequiredPlugin name="Sofa.GL.Component.Rendering3D"/> <!-- Needed to use components [OglModel] -->
     <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->
     <RequiredPlugin name="Sofa.Component.SceneUtility"/> <!-- Needed to use components [InfoComponent] -->
@@ -17,5 +17,5 @@
     <Node name="visual">
         <OglModel src="@../meshLoader"/>
     </Node>
-	
-</Node>
+    
+</Node>

scenes/vessel_skeleton.scn

@@ -1,5 +1,5 @@
 <Node name="root" dt="0.01" gravity="0 -1 0">
-	<VisualStyle displayFlags="showVisual showCollisionModels showWireframe"/>
+    <VisualStyle displayFlags="showVisual showCollisionModels showWireframe"/>
     <RequiredPlugin name="Sofa.GL.Component.Rendering3D"/> <!-- Needed to use components [OglModel] -->
     <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->
     <RequiredPlugin name="Sofa.Component.SceneUtility"/> <!-- Needed to use components [InfoComponent] -->
@@ -17,5 +17,5 @@
     <Node name="visual">
         <OglModel src="@../meshLoader"/>
     </Node>
-	
-</Node>
+    
+</Node>