[web-annotation] Issue: Clarify principle that features of external resources are not authoritative marked as i18n-review

r12a has just labeled an issue for 
https://github.com/w3c/web-annotation as "i18n-review":

== Clarify principle that features of external resources are not 
authoritative ==

Add a sub-section in section 2 that we provide information about 
resources not under our control as hints to the client.  Clients 
should always trust the canonical source of any data rather than a 
third party description.  This includes especially created, creator, 
modified, rights, format, language, textDirection, processingLanguage 
of resources, and all of the properties of Agents.

Discussion: http://www.w3.org/2016/08/05-annotation-irc#T15-30-52  
(above)

See https://github.com/w3c/web-annotation/issues/339