fix(doc): fix TCP sender examples (#29)

Author: puzpuzpuz

examples/tcp/auth-and-tls/main.go

@@ -12,6 +12,7 @@ func main() {
 	ctx := context.TODO()
 	sender, err := qdb.NewLineSender(
 		ctx,
+		qdb.WithTcp(),
 		qdb.WithAddress("localhost:9009"),
 		qdb.WithAuth(
 			"testUser1", // token name here

examples/tcp/auth/main.go

@@ -12,6 +12,7 @@ func main() {
 	ctx := context.TODO()
 	sender, err := qdb.NewLineSender(
 		ctx,
+		qdb.WithTcp(),
 		qdb.WithAddress("localhost:9009"),
 		qdb.WithAuth(
 			"testUser1", // token name here

examples/tcp/basic/main.go

@@ -11,7 +11,7 @@ import (
 func main() {
 	ctx := context.TODO()
 	// Connect to QuestDB running on 127.0.0.1:9009
-	sender, err := qdb.NewLineSender(ctx)
+	sender, err := qdb.NewLineSender(ctx, qdb.WithTcp())
 	if err != nil {
 		log.Fatal(err)
 	}