Example HTML shortcode not working

So I installed this plugin for the first time and activated the default “Example HTML shortcode”. Then I opened my website (using WooCommerce) and this snippet is no where to be found. How exactly is this supposed to work?

In the snippet I can see it is printing following words so I am expecting they will be displayed somewhere on site but no. I even check HTML source in browser and this sentence is not there.

$out = '<p>write your HTML shortcode content here</p>';