Partial valid-jsdoc corrections

src/ol/renderer/maprenderer.js

@@ -382,9 +382,9 @@ ol.renderer.Map.prototype.scheduleRemoveUnusedLayerRenderers =
 
 
 /**
- * @param {ol.layer.LayerState} state1
- * @param {ol.layer.LayerState} state2
- * @return {number}
+ * @param {ol.layer.LayerState} state1 First layer state.
+ * @param {ol.layer.LayerState} state2 Second layer state.
+ * @return {number} The zIndex difference.
  */
 ol.renderer.Map.sortByZIndex = function(state1, state2) {
   return state1.zIndex - state2.zIndex;

src/ol/renderer/webgl/webglmaprenderer.js

@@ -344,7 +344,7 @@ ol.renderer.webgl.Map.prototype.expireCache_ = function(map, frameState) {
 
 
 /**
- * @return {ol.webgl.Context}
+ * @return {ol.webgl.Context} The context.
  */
 ol.renderer.webgl.Map.prototype.getContext = function() {
   return this.context_;