Replace google closure syntax = with brackets around name

src/ol/webgl/Buffer.js

@@ -35,7 +35,7 @@ export const BufferUsage = {
 class WebGLArrayBuffer {
   /**
    * @param {number} type Buffer type, either ARRAY_BUFFER or ELEMENT_ARRAY_BUFFER.
-   * @param {number=} opt_usage Intended usage, either `STATIC_DRAW`, `STREAM_DRAW` or `DYNAMIC_DRAW`.
+   * @param {number} [opt_usage] Intended usage, either `STATIC_DRAW`, `STREAM_DRAW` or `DYNAMIC_DRAW`.
    * Default is `DYNAMIC_DRAW`.
    */
   constructor(type, opt_usage) {

src/ol/webgl/Helper.js

@@ -105,7 +105,7 @@ export const AttributeType = {
 /**
  * @typedef {Object} UniformInternalDescription
  * @property {string} name Name
- * @property {UniformValue=} value Value
+ * @property {UniformValue} [value] Value
  * @property {WebGLTexture} [texture] Texture
  * @private
  */
@@ -238,7 +238,7 @@ export const AttributeType = {
  */
 class WebGLHelper extends Disposable {
   /**
-   * @param {Options=} opt_options Options.
+   * @param {Options} [opt_options] Options.
    */
   constructor(opt_options) {
     super();