Small update to JSDocs of the exporters (playcanvas#5965)

Co-authored-by: Martin Valigursky <mvaligursky@snapchat.com>

extras/exporters/core-exporter.js

@@ -18,6 +18,11 @@ const textureBlitFragmentShader = `
         gl_FragColor = texture2D(blitTexture, uv0);
     }`;
 
+/**
+ * The base class for the exporters, implementing shared functionality.
+ *
+ * @category Exporter
+ */
 class CoreExporter {
     /**
      * Create a new instance of the exporter.
@@ -33,6 +38,8 @@ class CoreExporter {
      * @param {import('playcanvas').Color} [options.color] - The tint color to modify the texture with.
      * @param {number} [options.maxTextureSize] - Maximum texture size. Texture is resized if over the size.
      * @returns {Promise<HTMLCanvasElement>|Promise<undefined>} - The canvas element containing the image.
+     *
+     * @ignore
      */
     textureToCanvas(texture, options = {}) {
 

extras/exporters/gltf-exporter.js

@@ -122,6 +122,8 @@ const textureSemantics = [
 
 /**
  * Implementation of the GLTF 2.0 format exporter.
+ *
+ * @category Exporter
  */
 class GltfExporter extends CoreExporter {
     /**

extras/exporters/usdz-exporter.js

@@ -66,6 +66,8 @@ const materialValueTemplate = (type, name, value) => `                    ${type
 
 /**
  * Implementation of the USDZ format exporter. Note that ASCII version of the format (USDA) is used.
+ *
+ * @category Exporter
  */
 class UsdzExporter extends CoreExporter {
     /**