Fix Doc Issue

loaders/src/glTF/2.0/Extensions/KHR_materials_variants.ts

@@ -57,6 +57,8 @@ export class KHR_materials_variants implements IGLTFLoaderExtension {
 
     /**
      * Gets the list of available variant tag names for this asset.
+     * @param rootMesh The glTF root mesh
+     * @returns the list of all the variant names for this model
      */
     public static GetAvailableVariants(rootMesh: Mesh): string[] {
         const extensionMetadata = this._GetExtensionMetadata(rootMesh);
@@ -105,6 +107,7 @@ export class KHR_materials_variants implements IGLTFLoaderExtension {
 
     /**
      * Gets the last selected variant tag name(s).
+     * @param rootMesh The glTF root mesh
      * @returns The selected variant tag name(s).
      */
     public static GetLastSelectedVariant(rootMesh: Mesh): Nullable<string | string[]> {