Update the comment for 'MaxCallSendMsgSize' and 'MaxCallRecvMsgSize'

Signed-off-by: Benjamin Wang <benjamin.ahrtr@gmail.com>

client/v3/config.go

@@ -45,16 +45,16 @@ type Config struct {
 	DialKeepAliveTimeout time.Duration `json:"dial-keep-alive-timeout"`
 
 	// MaxCallSendMsgSize is the client-side request send limit in bytes.
-	// If 0, it defaults to 2.0 MiB (2 * 1024 * 1024).
-	// Make sure that "MaxCallSendMsgSize" < server-side default send/recv limit.
+	// Defaults to `math.MaxInt32` if not set.
+	// Refer to https://pkg.go.dev/google.golang.org/grpc@v1.67.1#MaxCallSendMsgSize.
+	// Make sure that "MaxCallSendMsgSize" < server-side default recv limit.
 	// ("--max-request-bytes" flag to etcd or "embed.Config.MaxRequestBytes").
 	MaxCallSendMsgSize int
 
 	// MaxCallRecvMsgSize is the client-side response receive limit.
-	// If 0, it defaults to "math.MaxInt32", because range response can
-	// easily exceed request send limits.
-	// Make sure that "MaxCallRecvMsgSize" >= server-side default send/recv limit.
-	// ("--max-recv-bytes" flag to etcd).
+	// Defaults to 4MB if not set.
+	// Refer to https://pkg.go.dev/google.golang.org/grpc@v1.67.1#MaxCallRecvMsgSize.
+	// Make sure that "MaxCallRecvMsgSize" >= server-side default send limit.
 	MaxCallRecvMsgSize int
 
 	// TLS holds the client secure credentials, if any.