doc: fix process links to console.log/error

Fixes: nodejs/node#11717

PR-URL: nodejs/node#11718
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

doc/api/process.md

@@ -1771,6 +1771,8 @@ cases:
 [`Error`]: errors.html#errors_class_error
 [`EventEmitter`]: events.html#events_class_eventemitter
 [`JSON.stringify()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
+[`console.error()`]: console.html#console_console_error_data_args
+[`console.log()`]: console.html#console_console_log_data_args
 [`net.Server`]: net.html#net_class_net_server
 [`net.Socket`]: net.html#net_class_net_socket
 [`process.argv`]: #process_process_argv