I need the action hook name when WordPress updates settings on plugin's option's page. I have tried looking at the action hooks at Codex > Plugins API for hooks and couldn't exactly find the right one. I have been trying to painstakingly find this hook, but no luck.
Give feedback to the WordPress administrator that WordPress has updated settings (saved options on the plugin's option page) with a message like "Settings saved." at the beginning of the plugin's options page.
Can anyone please help? I would really appreciate it. Thank you.