Code review changes.

src/core/ext/client_channel/client_channel.c

@@ -316,7 +316,7 @@ static void on_resolver_result_changed(grpc_exec_ctx *exec_ctx, void *arg,
     // Use pick_first if nothing was specified and we didn't select grpclb
     // above.
     if (lb_policy_name == NULL) lb_policy_name = "pick_first";
-    // If using a proxy, add channel arg for HTTP CONNECT server.
+    // If using a proxy, add channel arg for server in HTTP CONNECT request.
     if (chand->proxy_name != NULL) {
       grpc_arg new_arg;
       new_arg.key = GRPC_ARG_HTTP_CONNECT_SERVER;

src/core/ext/client_channel/http_connect_handshaker.h

@@ -34,7 +34,8 @@
 #ifndef GRPC_CORE_EXT_CLIENT_CHANNEL_HTTP_CONNECT_HANDSHAKER_H
 #define GRPC_CORE_EXT_CLIENT_CHANNEL_HTTP_CONNECT_HANDSHAKER_H
 
-/// Channel arg indicating HTTP CONNECT server (string).
+/// Channel arg indicating the server in HTTP CONNECT request (string).
+/// The presence of this arg triggers the use of HTTP CONNECT.
 #define GRPC_ARG_HTTP_CONNECT_SERVER "grpc.http_connect_server"
 
 /// Channel arg indicating HTTP CONNECT headers (string).