doc: document windowsHide for child_process.fork

Describe the existing windowsHide option and its false default alongside
the other fork options, using the wording already documented for spawn.

Refs: DefinitelyTyped/DefinitelyTyped#75525
Signed-off-by: christopher-buss <christopher.buss+github@protonmail.com>
Assisted-by: Codex
Co-authored-by: Codex <noreply@openai.com>
PR-URL: #65887
Reviewed-By: Xuguang Mei <meixuguang@gmail.com>
Reviewed-By: Stefan Stojanovic <stefan.stojanovic@janeasystems.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: 2 people

doc/api/child_process.md

@@ -561,6 +561,8 @@ changes:
     is used, it must contain exactly one item with value `'ipc'` or an error
     will be thrown. For instance `[0, 1, 2, 'ipc']`.
   * `uid` {number} Sets the user identity of the process (see setuid(2)).
+  * `windowsHide` {boolean} Hide the subprocess console window that would
+    normally be created on Windows systems. **Default:** `false`.
   * `windowsVerbatimArguments` {boolean} No quoting or escaping of arguments is
     done on Windows. Ignored on Unix. **Default:** `false`.
   * `timeout` {number} In milliseconds the maximum amount of time the process