Add color to api docs

src/ol/color/color.js

@@ -18,6 +18,7 @@ goog.require('ol');
  * red, green, and blue should be integers in the range 0..255 inclusive.
  * alpha should be a float in the range 0..1 inclusive.
  * @typedef {Array.<number>}
+ * @api
  */
 ol.Color;
 

src/ol/color/color.jsdoc

@@ -0,0 +1,3 @@
+/**
+ * @namespace ol.color
+ */