add missing 'to'
Merge pull request #459 from phluid61/copy-editing

add missing "to" in WINDOW_UPDATE
Editorial fix
More editorial fix
Merge pull request #461 from summerwind/editorial-fix

Editorial fix
Cleaning up whitespace and indentation.
Adding first pass for BLOCKED frame.
Adding warning regarding BLOCKED
Cleaning up ALTSVC frame description.
Updating GOAWAY to allow for multiple sending, editorial cleanup of same.
Adding more BLOCKED references.
merge