doc: update fs.utimes{,Sync} changelog

Specify that `NaN`, `Infinity`, and `-Infinity` are no longer valid
values for the `atime` and `mtime` arguments.

PR-URL: #15680
Fixes: #15453
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

doc/api/fs.md

@@ -2339,6 +2339,10 @@ and `fs.unwatchFile()` when possible.
 <!-- YAML
 added: v0.4.2
 changes:
+   - version: v8.0.0
+    pr-url: https://github.com/nodejs/node/pull/11919
+    description: `NaN`, `Infinity`, and `-Infinity` are no longer valid time
+                 specifiers.
   - version: v7.6.0
     pr-url: https://github.com/nodejs/node/pull/10739
     description: The `path` parameter can be a WHATWG `URL` object using `file:`
@@ -2371,6 +2375,10 @@ The `atime` and `mtime` arguments follow these rules:
 <!-- YAML
 added: v0.4.2
 changes:
+  - version: v8.0.0
+    pr-url: https://github.com/nodejs/node/pull/11919
+    description: `NaN`, `Infinity`, and `-Infinity` are no longer valid time
+                 specifiers.
   - version: v7.6.0
     pr-url: https://github.com/nodejs/node/pull/10739
     description: The `path` parameter can be a WHATWG `URL` object using `file:`