docs: Fix showing the util namespace

Author: manthey

src/util/common.js

@@ -998,7 +998,7 @@ var util = {
    * @param {object} target target object to modify.
    * @param {object} sources object(s) to merge into the target.
    * @returns {object} The merged object.
-   * @member geo.util
+   * @memberof geo.util
    */
   deepMerge: function (target, ...sources) {
     for (const source of sources) {

src/util/mesh.js

@@ -33,6 +33,7 @@
  *    elements, falsy for vertices.
  * @returns {geo.meshFeature.meshColoredInfo} An object with the colored mesh
  *    information.
+ * @memberof geo.util
  */
 function createColoredMesh(feature, elementValues) {
   var util = require('../util');

src/webgl/lookupTable2D.js

@@ -8,6 +8,7 @@ var vgl = require('../vgl');
  * @param {vgl.renderState} renderState An object that contains the context
  *   used for drawing.
  * @param {number} textureUnit The number of the texture unit [0-15].
+ * @private
  */
 function activateTextureUnit(renderState, textureUnit) {
   if (textureUnit >= 0 && textureUnit <= 31) {