Add private tag to unexposed functions. [ci skip]

lib/main/build-dist.js

@@ -18,6 +18,7 @@ var baseLodash = path.join(basePath, filename),
 /**
  * Creates browser builds of Lodash at the `target` path.
  *
+ * @private
  * @param {string} target The output directory path.
  */
 function build() {