WooCommerce Change Description Tab title and heading to product title

functions.php

<?php
// Change the description tab title to product name
add_filter( 'woocommerce_product_tabs', 'wc_change_product_description_tab_title', 10, 1 );
function wc_change_product_description_tab_title( $tabs ) {
  global $post;
	if ( isset( $tabs['description']['title'] ) )
		$tabs['description']['title'] = $post->post_title;
	return $tabs;
}

// Change the description tab heading to product name
add_filter( 'woocommerce_product_description_heading', 'wc_change_product_description_tab_heading', 10, 1 );
function wc_change_product_description_tab_heading( $title ) {
	global $post;
	return $post->post_title;
}
?>

Thanks kloon, really useful..:-)

Perfect! Thank you!

hey. i wanted to add a word "WHY" just before product title in the product description tab title. how can i do that i'm trying different methods but nothing is working for me.
any help is appreciated