docs(updater): fix pronoun (#3475)

Author: phillc

src/content/docs/plugin/updater.mdx

@@ -567,7 +567,7 @@ For more information see the [Rust API documentation].
 </Tabs>
 
 Note that restarting your app immediately after installing an update is not required and you can choose
-how to handle the update by either waiting until the user manually restarts the app, or prompting him to select when to do so.
+how to handle the update by either waiting until the user manually restarts the app, or prompting them to select when to do so.
 
 :::note
 On Windows the application is automatically exited when the install step is executed due to a limitation of Windows installers.