Change proposal ISSUE-234

Delete the first paragraph of Section 6, which currently reads "/When a 
user sends a DNT: 0 signal, the user is expressing a preference for a 
personalized experience. This signal indicates explicit consent for data 
collection, retention, processing, disclosure, and use by the recipient 
of this signal to provide a personalized experience for the user. This 
recommendation places no restrictions on data collected from requests 
received with DNT: 0./"

Rationale: it's not agreed that this is what DNT:0 means, especially as 
we've not agreed what DNT:1 means. And whatever DNT:0 means should just 
be "not DNT:1." Personalization is not, in and of itself, the issue.