Update documentation

client.go

@@ -74,7 +74,7 @@ func NewProxyRequest(host, rawurl string) (*Request, error) {
 	}, nil
 }
 
-// Do completes a request.
+// Do sends a Gemini request and returns a Gemini response.
 func (c *Client) Do(req *Request) (*Response, error) {
 	host := req.Host
 	if strings.LastIndex(host, ":") == -1 {

server.go

@@ -105,7 +105,7 @@ func (s *Server) Serve(ln net.Listener) error {
 	}
 }
 
-// Handler handles a url with a response.
+// A Handler responds to a Gemini request.
 type Handler interface {
 	// Serve accepts a url, as that is the only information that is provided in
 	// a Gemini request.