punycode: fix jsdoc references

lib/punycode.js

@@ -60,11 +60,11 @@ function error(type) {
  * item.
  * @returns {Array} A new array of values returned by the callback function.
  */
-function map(array, fn) {
+function map(array, callback) {
 	const result = [];
 	let length = array.length;
 	while (length--) {
-		result[length] = fn(array[length]);
+		result[length] = callback(array[length]);
 	}
 	return result;
 }
@@ -76,22 +76,22 @@ function map(array, fn) {
  * @param {String} domain The domain name or email address.
  * @param {Function} callback The function that gets called for every
  * character.
- * @returns {Array} A new string of characters returned by the callback
+ * @returns {String} A new string of characters returned by the callback
  * function.
  */
-function mapDomain(string, fn) {
-	const parts = string.split('@');
+function mapDomain(domain, callback) {
+	const parts = domain.split('@');
 	let result = '';
 	if (parts.length > 1) {
 		// In email addresses, only the domain name should be punycoded. Leave
 		// the local part (i.e. everything up to `@`) intact.
 		result = parts[0] + '@';
-		string = parts[1];
+		domain = parts[1];
 	}
 	// Avoid `split(regex)` for IE8 compatibility. See #17.
-	string = string.replace(regexSeparators, '\x2E');
-	const labels = string.split('.');
-	const encoded = map(labels, fn).join('.');
+	domain = domain.replace(regexSeparators, '\x2E');
+	const labels = domain.split('.');
+	const encoded = map(labels, callback).join('.');
 	return result + encoded;
 }
 
@@ -140,7 +140,7 @@ function ucs2decode(string) {
  * @param {Array} codePoints The array of numeric code points.
  * @returns {String} The new Unicode string (UCS-2).
  */
-const ucs2encode = array => String.fromCodePoint(...array);
+const ucs2encode = codePoints => String.fromCodePoint(...codePoints);
 
 /**
  * Converts a basic code point into a digit/integer.