Add private tag to unexposed functions. [ci skip]

lib/fp/build-doc.js

@@ -23,6 +23,7 @@ var templateData = {
  * Converts arranged argument `indexes` into a named argument string
  * representation of their order.
  *
+ * @private
  * @param {number[]} indexes The arranged argument indexes.
  * @returns {string} Returns the named argument string.
  */
@@ -37,6 +38,7 @@ function toArgOrder(indexes) {
 /**
  * Converts `funcNames` into a chunked list string representation.
  *
+ * @private
  * @param {string[]} funcNames The function names.
  * @returns {string} Returns the function list string.
  */
@@ -68,6 +70,7 @@ function toFuncList(funcNames) {
 /**
  * Creates the FP-Guide wiki at the `target` path.
  *
+ * @private
  * @param {string} target The output file path.
  */
 function build(target) {