wp-notices.php
public function dismiss_notice( $id ) {
		$notice = self::$instance->get_notice( self::$instance->get_id( $id ) );
		if ( self::$instance->is_dismissed( $id ) ) {
			return false;
		}
		return 'user' === $notice['scope'] ? self::$instance->dismiss_user( $id ) : self::$instance->dismiss_global( $id );
	}
public function dismiss_notice( $id ) {
		$notice = self::$instance->get_notice( self::$instance->get_id( $id ) );
		if ( self::$instance->is_dismissed( $id ) ) {
			return false;
		}
		return 'user' === $notice['scope'] ? self::$instance->dismiss_user( $id ) : self::$instance->dismiss_global( $id );
	}
Dismiss notice into the database.

@param string $id
@return void