update readme

README.md

@@ -3,11 +3,13 @@
 Replace a link for a set of hostnames with their respective referral links.
 
 For example, you might want to replace links to digitalocean.com with my referral link, which is https://m.do.co/c/a5bf212d9a92. Install this theme component and you can do just that! You can instead
-use your referral ink for Digital Ocean or whatever other sites you wish.
+use your referral link for Digital Ocean or whatever other sites you wish.
 
 The theme setting `affilliate link map` takes a list of "HOSTNAME,referral_url" mappings and
 then replaces those links (<div class='cooked'>) with the referral link. This replacement happens
 in the browser, so there is no need to rebake posts after making changes.
 
 This replaces _only_ links to the home page, so links to other pages on the site still function
-as expected.
+as expected. See https://dashboard.literatecomputing.com/t/discourse-affiliate-linker/950 for an example of its use.
+
+For hostname you enter, it looks for with and without the `www`. It also checks for both `http` and `https` links. So `digitalocean.com` will match and replace `http://www.digitalocean.com/`, `https://digitalocean.com` and the other two variations.