Add property to all layers api doc

src/ol/layer/Layer.js

@@ -17,6 +17,7 @@ import SourceState from '../source/State.js';
 
 /**
  * @typedef {Object} Options
+ * @property {string} [className='ol-layer'] A CSS class name to set to the layer element.
  * @property {number} [opacity=1] Opacity (0, 1).
  * @property {boolean} [visible=true] Visibility.
  * @property {import("../extent.js").Extent} [extent] The bounding extent for layer rendering.  The layer will not be
@@ -35,7 +36,6 @@ import SourceState from '../source/State.js';
  * @property {import("../PluggableMap.js").default} [map] Map.
  * @property {RenderFunction} [render] Render function. Takes the frame state as input and is expected to return an
  * HTML element. Will overwrite the default rendering for the layer.
- * @property {string} [className='ol-layer'] A CSS class name to set to the layer element.
  */