doc: fix typo in child_process.md

PR-URL: #17727
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Daniel Bevenius <[email protected]>
Reviewed-By: Jon Moss <[email protected]>
Reviewed-By: James M Snell <[email protected]>

doc/api/child_process.md

@@ -984,7 +984,7 @@ added: v0.1.90
 
 * `signal` {string}
 
-The `subprocess.kill()` methods sends a signal to the child process. If no
+The `subprocess.kill()` method sends a signal to the child process. If no
 argument is given, the process will be sent the `'SIGTERM'` signal. See
 signal(7) for a list of available signals.