doc: add Note of options.stdio into child_process

PR-URL: #26604
Refs: #22892 (comment)
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>

doc/api/child_process.md

@@ -631,7 +631,8 @@ pipes between the parent and child. The value is one of the following:
    event has occurred).
 6. Positive integer - The integer value is interpreted as a file descriptor
    that is currently open in the parent process. It is shared with the child
-   process, similar to how {Stream} objects can be shared.
+   process, similar to how {Stream} objects can be shared. Passing sockets
+   is not supported on Windows.
 7. `null`, `undefined` - Use default value. For stdio fds 0, 1, and 2 (in other
    words, stdin, stdout, and stderr) a pipe is created. For fd 3 and up, the
    default is `'ignore'`.