[ldn] Issue: Example should have charset=UTF-8 marked as i18n

r12a has just labeled an issue for https://github.com/w3c/ldn as 
"i18n":

== Example should have charset=UTF-8 ==
[sent on behalf of Addison Phillips]
https://www.w3.org/TR/ldn/#discovery

Section 3.1 ("Discovery") contains an example of returning content 
type of text/html. This should include `charset=UTF-8` by way of 
setting a good example.

> Content-Type: text/html
> 
> <a href="/inbox/" rel="http://www.w3.org/ns/ldp#inbox">My 
inbox</a>

See https://github.com/w3c/ldn/issues/49