Merge pull request #63 from CesiumGS/fix-multiple-classes-description

Fix description of MultipleClasses sample

glTF/README.md

@@ -28,7 +28,7 @@ The sandcastle code for viewing the `EXT_structural_metadata` samples is shown i
 | [`FeatureIdTextureAndPropertyTable`](EXT_structural_metadata/FeatureIdTextureAndPropertyTable/)<br/> Texels that are associated with properties that are stored in a property table | <img src="EXT_structural_metadata/FeatureIdTextureAndPropertyTable/screenshot/FeatureIdTextureAndPropertyTable.gif" width="300">
 | [`MultipleFeatureIdsAndProperties`](EXT_structural_metadata/MultipleFeatureIdsAndProperties/)<br/> Multiple feature ID sets that are associated with metadata containing multiple properties | <img src="EXT_structural_metadata/MultipleFeatureIdsAndProperties/screenshot/MultipleFeatureIdsAndProperties.gif" width="300">
 | [`SharedPropertyTable`](EXT_structural_metadata/SharedPropertyTable/)<br/> Two mesh primitives that define feature IDs, where both refer to the same property table | <img src="EXT_structural_metadata/SharedPropertyTable/screenshot/SharedPropertyTable.png" width="300">
-| [`MultipleClasses`](EXT_structural_metadata/MultipleClasses/)<br/> Two mesh primitives that define feature IDs, where both refer to the same property table | <img src="EXT_structural_metadata/MultipleClasses/screenshot/MultipleClasses.gif" width="300">
+| [`MultipleClasses`](EXT_structural_metadata/MultipleClasses/)<br/> A mesh primitive that contains two feature IDs that are used for looking up the values for two different metadata classes | <img src="EXT_structural_metadata/MultipleClasses/screenshot/MultipleClasses.gif" width="300">
 | [`ComplexTypes`](EXT_structural_metadata/ComplexTypes/)<br/> Features that contain properties with more complex types | <img src="EXT_structural_metadata/ComplexTypes/screenshot/ComplexTypes.png" width="300">
 | [`SimplePropertyTexture`](EXT_structural_metadata/SimplePropertyTexture/)<br/> Properties that are stored in a texture | <img src="EXT_structural_metadata/SimplePropertyTexture/screenshot/SimplePropertyTexture.gif" width="300">
 | [`PropertyAttributesPointCloud`](EXT_structural_metadata/PropertyAttributesPointCloud/)<br/> Properties that are stored in vertex attributes, contained in a 3D Tiles tileset that contains statistics for the metadata values. | <img src="EXT_structural_metadata/PropertyAttributesPointCloud/screenshot/PropertyAttributesPointCloud.gif" width="300">