Deprecated function: update documentation

Hi, Creators!

Than you for this plugin! It looks like the most suitable for my needs. But there are some issues with the plugin.

The documentation on the plugin setting page shows that I might use the provided functions in my theme template files: <?php echo ic_reviews_average() ?> and <?php ic_reviews() ?>.

When I’d tried to use the function the error occurred:
Fatal error: Uncaught Error: Call to undefined function ic_reviews_average()

Digging into code shows, that function ic_reviews_average() actually doesn’t exist. If it is deprecated – please, remove the mention in the documentation.

The second question…
Does it still acceptable to use the function ic_reviews() in my template files? Is there any recommendation to use echo do_shortcode('[reviews]') instead?