Use @api annotation instead of @todo api

src/ol/control/scalelinecontrol.js

@@ -29,7 +29,7 @@ ol.control.ScaleLineProperty = {
  * Units for the scale line. Supported values are `'degrees'`, `'imperial'`,
  * `'nautical'`, `'metric'`, `'us'`.
  * @enum {string}
- * @todo api
+ * @api
  */
 ol.control.ScaleLineUnits = {
   DEGREES: 'degrees',
@@ -50,7 +50,7 @@ ol.control.ScaleLineUnits = {
  * @constructor
  * @extends {ol.control.Control}
  * @param {olx.control.ScaleLineOptions=} opt_options Scale line options.
- * @todo api
+ * @api
  */
 ol.control.ScaleLine = function(opt_options) {
 
@@ -138,7 +138,7 @@ ol.control.ScaleLine.LEADING_DIGITS = [1, 2, 5];
  * @return {ol.control.ScaleLineUnits|undefined} The units to use in the scale
  *     line.
  * @todo observable
- * @todo api
+ * @api
  */
 ol.control.ScaleLine.prototype.getUnits = function() {
   return /** @type {ol.control.ScaleLineUnits|undefined} */ (
@@ -175,7 +175,7 @@ ol.control.ScaleLine.prototype.handleUnitsChanged_ = function() {
 /**
  * @param {ol.control.ScaleLineUnits} units The units to use in the scale line.
  * @todo observable
- * @todo api
+ * @api
  */
 ol.control.ScaleLine.prototype.setUnits = function(units) {
   this.set(ol.control.ScaleLineProperty.UNITS, units);