fix: region tag names

Author: Alan5142

appengine-java21/ee8/datastore/src/test/java/com/example/appengine/MetadataKindsTest.java

@@ -69,7 +69,7 @@ public void tearDown() {
     helper.tearDown();
   }
 
-  // [START kind_query_example]
+  // [START gae_java21_datastore_kind_query]
   void printLowercaseKinds(DatastoreService ds, PrintWriter writer) {
 
     // Start with unrestricted kind query
@@ -102,7 +102,7 @@ void printLowercaseKinds(DatastoreService ds, PrintWriter writer) {
       writer.println("  " + e.getKey().getName());
     }
   }
-  // [END kind_query_example]
+  // [END gae_java21_datastore_kind_query]
 
   @Test
   public void printLowercaseKinds_printsKinds() throws Exception {

appengine-java21/ee8/datastore/src/test/java/com/example/appengine/MetadataNamespacesTest.java

@@ -70,7 +70,7 @@ public void tearDown() {
     helper.tearDown();
   }
 
-  // [START queries_intro_example]
+  // [START gae_java21_datastore_queries_intro]
   void printAllNamespaces(DatastoreService ds, PrintWriter writer) {
     Query q = new Query(Entities.NAMESPACE_METADATA_KIND);
 
@@ -84,7 +84,7 @@ void printAllNamespaces(DatastoreService ds, PrintWriter writer) {
       }
     }
   }
-  // [END queries_intro_example]
+  // [END gae_java21_datastore_queries_intro]
 
   @Test
   public void printAllNamespaces_printsNamespaces() throws Exception {
@@ -99,7 +99,7 @@ public void printAllNamespaces_printsNamespaces() throws Exception {
     assertThat(response).contains("another-namespace");
   }
 
-  // [START namespace_query_example]
+  // [START gae_java21_datastore_namespace_query]
   List<String> getNamespaces(DatastoreService ds, String start, String end) {
 
     // Start with unrestricted namespace query
@@ -134,7 +134,7 @@ List<String> getNamespaces(DatastoreService ds, String start, String end) {
     // Return result list
     return results;
   }
-  // [END namespace_query_example]
+  // [END gae_java21_datastore_namespace_query]
 
   @Test
   public void getNamespaces_returnsNamespaces() throws Exception {

appengine-java21/ee8/datastore/src/test/java/com/example/appengine/TransactionsTest.java

@@ -168,7 +168,7 @@ public void creatingAnEntityInASpecificEntityGroup() throws Exception {
 
   @Test
   public void crossGroupTransactions() throws Exception {
-    // [START gae_java21_datastore_cross-group_XG_transactions_using_the_Java_low-level_API]
+    // [START gae_java21_datastore_cross_group_transactions]
     DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
     TransactionOptions options = TransactionOptions.Builder.withXG(true);
     Transaction txn = datastore.beginTransaction(options);
@@ -182,7 +182,7 @@ public void crossGroupTransactions() throws Exception {
     datastore.put(txn, b);
 
     txn.commit();
-    // [END gae_java21_datastore_cross-group_XG_transactions_using_the_Java_low-level_API]
+    // [END gae_java21_datastore_cross_group_transactions]
   }
 
   @Test