Remove 'struct' jsdoc tags, code indentation

src/ol/style/Atlas.js

@@ -31,7 +31,6 @@ class Atlas {
    * managed with the bin packing algorithm described in:
    * http://www.blackpawn.com/texts/lightmaps/
    *
-   * @struct
    * @param {number} size The size in pixels of the sprite image.
    * @param {number} space The space in pixels between images.
    *    Because texture coordinates are float values, the edges of

src/ol/style/AtlasManager.js

@@ -54,7 +54,6 @@ class AtlasManager {
    * If an application uses many images or very large images, it is recommended
    * to set a higher `size` value to avoid the creation of too many atlases.
    *
-   * @struct
    * @api
    * @param {module:ol/style/AtlasManager~Options=} opt_options Options.
    */