Update nodejs compat for javascript.function.rest_parameters

Flagged support:

- [Node.js changelog entry for version 3.0.0](https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_IOJS.md#2015-08-04-version-300-rvagg)
- [Pull Request](nodejs/node#2022)
- [Commit, with anchor to relevant line](nodejs/node@70d1f32f56#diff-b2e04de0d939630d882245c2243e7e47R200)

Stable support:

- [Node.js changelog entry for version 6.0.0](https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V6.md#2016-04-26-version-600-current-jasnell)
- [Pull Request](nodejs/node#4106)
- [Commit, with anchor to relevant line](nodejs/node@8a43a3d#diff-b2e04de0d939630d882245c2243e7e47R217)

Flag removal:
- [Node.js changelog entry for version 6.0.0](https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V6.md#2016-04-26-version-600-current-jasnell)
- [Pull Request](nodejs/node#4722)
- [Commit, with anchor to relevant line](nodejs/node@069e02a#diff-b2e04de0d939630d882245c2243e7e47L221)

javascript/functions.json

@@ -858,7 +858,8 @@
             },
             "nodejs": [
               {
-                "version_added": "57"
+                "version_added": "6.0.0",
+                "notes": "Added in <a href='https://github.com/nodejs/node/pull/4106'>PR #4106</a>."
               },
               {
                 "version_added": "3.0.0",
@@ -869,7 +870,7 @@
                     "name": "--harmony-rest-parameters"
                   }
                 ],
-                "notes": "See Node.js <a href='https://github.com/nodejs/node/pull/2022'>pull request 2022</a>."
+                "notes": "Added in <a href='https://github.com/nodejs/node/pull/2022'>PR #2022</a>."
               }
             ],
             "opera": {