WordPress at a glance
action is not described

woocommerce_sections_(current_tab) action-hook . WC 1.0

Usage

add_action( 'woocommerce_sections_(current_tab)', 'action_function_name_6389' );
function action_function_name_6389(){
	// action...
}

Where the hook is called

In file: /includes/admin/views/html-admin-settings.php
woocommerce_sections_(current_tab)
woocommerce/includes/admin/views/html-admin-settings.php 36
do_action( 'woocommerce_sections_' . $current_tab );

Where in WP core the hook is used WooCommerce

woocommerce/includes/admin/settings/class-wc-settings-page.php 39
add_action( 'woocommerce_sections_' . $this->id, array( $this, 'output_sections' ) );
woocommerce/includes/admin/settings/class-wc-settings-tax.php 32
add_action( 'woocommerce_sections_' . $this->id, array( $this, 'output_sections' ) );