fix article

l.815
before: An endpoint MUST NOT send frames other than than <x:ref>HEADERS</x:ref> or
fix: An endpoint MUST NOT send frames other than <x:ref>HEADERS</x:ref> or
fix article

before: a HTML
fix: an HTML
fix article

before: a END_STREAM
fix: an END_STREAM
fix article

before:any frame type
fix:any frame types
fix article

before: any frame
fix: any frames
Merge pull request #412 from shotsky/master

Yeah, my grammar really is that bad.
Adding Connection header field to trailers example.
Adding Trailers header field to the example.
Adding Trailer header field to the example.
Adding my own overview proposal.
Fixing examples.  Closes #411.
Drop deflate as a required content-encoding.

See http://lists.w3.org/Archives/Public/ietf-http-wg/2014JanMar/0699.html
Applying Herve's suggestions.
Merge pull request #414 from http2/overview-mt

Re-write of the protocol overview
Rewriting privacy consideration.  Closes #399.
Merge branch 'master' of https://github.com/http2/http2-spec
Adding initial value for SETTINGS_INITIAL_WINDOW_SIZE.  More clarification.  Closes #384.
Attempting to clarify for #403.
Taking a bash at what it means to be authoritative for #405.
Removing 6454 reference.  Tweaking connection management section.  Might help with #405, #413.