Fix typo in protocols/http

The first commit just fix the typo: `doesn't'` -> `doesn't`
For the second, I think there is the word "process" missing. It should be the "port number of the server process which implements the method", not simply the "port number of the server which implements the method" because it is the process who implements it and not the port number nor the server.
The third, is simply a missing ')'