MINOR: update the test.api README.md (apache#17809)

Reviewers: Chia-Ping Tsai <[email protected]>

Author: m1a2st

test-common/test-common-api/src/main/java/org/apache/kafka/common/test/api/README.md

@@ -14,9 +14,12 @@ This annotation has fields for a set of cluster types and number of brokers, as
 Arbitrary server properties can also be provided in the annotation:
 
 ```java
-@ClusterTest(types = {Type.KRAFT}, securityProtocol = "PLAINTEXT", properties = {
-  @ClusterProperty(key = "inter.broker.protocol.version", value = "2.7-IV2"),
-  @ClusterProperty(key = "socket.send.buffer.bytes", value = "10240"),
+@ClusterTest(
+  types = {Type.KRAFT}, 
+  brokerSecurityProtocol = SecurityProtocol.PLAINTEXT, 
+  properties = {
+    @ClusterProperty(key = "inter.broker.protocol.version", value = "2.7-IV2"),
+    @ClusterProperty(key = "socket.send.buffer.bytes", value = "10240"),
 })
 void testSomething() { ... }
 ```
@@ -25,8 +28,8 @@ Multiple `@ClusterTest` annotations can be given to generate more than one test
 
 ```scala
 @ClusterTests(Array(
-    @ClusterTest(securityProtocol = "PLAINTEXT"),
-    @ClusterTest(securityProtocol = "SASL_PLAINTEXT")
+  @ClusterTest(brokerSecurityProtocol = SecurityProtocol.PLAINTEXT),
+  @ClusterTest(securityProtocol = SecurityProtocol.SASL_PLAINTEXT)
 ))
 def testSomething(): Unit = { ... }
 ```
@@ -45,18 +48,18 @@ produce any number of test configurations using a fluent builder style API.
 import java.util.Arrays;
 
 @ClusterTemplate("generateConfigs")
-void testSomething() { ...}
+void testSomething() { ... }
 
 static List<ClusterConfig> generateConfigs() {
   ClusterConfig config1 = ClusterConfig.defaultClusterBuilder()
           .name("Generated Test 1")
           .serverProperties(props1)
-          .ibp("2.7-IV1")
+          .setMetadataVersion(MetadataVersion.IBP_2_7_IV1)
           .build();
   ClusterConfig config2 = ClusterConfig.defaultClusterBuilder()
           .name("Generated Test 2")
           .serverProperties(props2)
-          .ibp("2.7-IV2")
+          .setMetadataVersion(MetadataVersion.IBP_2_7_IV2)
           .build();
   ClusterConfig config3 = ClusterConfig.defaultClusterBuilder()
           .name("Generated Test 3")