docs(http): add description of response header object and typo fix.
docs(http): add description of response header object and typo fix.

FWeinb/cerebral,cerebral/cerebral,bdjnk/cerebral,christianalfoni/cerebral,cerebral/cerebral,fopsdev/cerebral,idream3/cerebral,garth/cerebral,fopsdev/cerebral,yusufsafak/cerebral,yusufsafak/cerebral,FWeinb/cerebral,bdjnk/cerebral,idream3/cerebral,garth/cerebral,christianalfoni/cerebral