docs: fix copy/paste typo

Replace "array" with "object" (looks like it was likely a copy/paste error from when these docs were originally brought over from `.map()`), and rephrase the sentence accordingly.  I also normalized an occurrence of "result" vs. "results" to match.

> *NOTE:* I did not yet go through and do the same to `.mapValuesLimit()` and `.mapValuesSeries()` in this commit.  I'm happy to take care of that in this PR, but it's purely a matter of copy and pasting the relevant comments.

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/mapValues.js b/lib/mapValues.js
index a0a9470..c3daa56 100644
--- a/lib/mapValues.js
+++ b/lib/mapValues.js
@@ -26,8 +26,9 @@ import doLimit from './internal/doLimit';
  * called once it has completed with an error (which can be `null`) and a
  * transformed value. Invoked with (value, key, callback).
  * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Results is an array of the
- * transformed items from the `obj`. Invoked with (err, result).
+ * functions have finished, or an error occurs. `result` is a new object consisting
+ * of each key from `obj`, with each transformed result on the right-hand side.
+ * Invoked with (err, result).
  * @example
  *
  * async.mapValues({
@@ -37,7 +38,7 @@ import doLimit from './internal/doLimit';
  * }, function (file, key, callback) {
  *   fs.stat(file, callback);
  * }, function(err, result) {
- *     // results is now a map of stats for each file, e.g.
+ *     // result is now a map of stats for each file, e.g.
  *     // {
  *     //     f1: [stats for file1],
  *     //     f2: [stats for file2],