Updated Caddyfile.example to clarify ActivityPub requirement (#37)

- ActivityPub only requires this redirect if you are using a www domain

caddy/Caddyfile.example

@@ -53,7 +53,7 @@
 # Redirect root -> www domain
 # To redirect the non-www variant of your domain to the www variant uncomment the 4 lines below and change CHANGE_ME to your root domain
 # Note: You must have DNS setup correctly for both domains for this to work
-# If you want to use ActivityPub you _must_ enable this redirect
+# When using ActivityPub with a www. domain, you must enable this redirect for ActivityPub to work correctly
 # CHANGE_ME {
 # 	import snippets/Logging
 # 	redir https://{$DOMAIN}{uri}