charter: clarify if/how/when this touches browsers and users

[samuelweiler]

I want to charter to be more clear about if and when this technology will touch browsers. I understand that there is an intention, in the new work proposed, to bring things back to the browser - and I want the charter to be explicit about that, one way or the other.

[samuelweiler]

also see w3c/trace-context#392

[plehegar]

Proposed text is:
[[
This update is intended to include a mechanism to carry context information in protocol responses, thus allowing context information to be accessed in Web browsers.
]]

[samuelweiler]

That's not really clear to me - what's the wordier version?

[plehegar]

I included some wording. Hopefully this is good enough for now.