fix(httpc): fix typo errors (#2189)

rest/httpc/responses.go

@@ -18,12 +18,12 @@ func Parse(resp *http.Response, val interface{}) error {
 	return ParseJsonBody(resp, val)
 }
 
-// ParseHeaders parses the rsponse headers.
+// ParseHeaders parses the response headers.
 func ParseHeaders(resp *http.Response, val interface{}) error {
 	return encoding.ParseHeaders(resp.Header, val)
 }
 
-// ParseJsonBody parses the rsponse body, which should be in json content type.
+// ParseJsonBody parses the response body, which should be in json content type.
 func ParseJsonBody(resp *http.Response, val interface{}) error {
 	if withJsonBody(resp) {
 		return mapping.UnmarshalJsonReader(resp.Body, val)