Clarify OAuth2 strategy is for Microsoft Entra ID, not connection strings

Update documentation to distinguish between OAuth2/Entra ID authentication
(handled by KafkaOAuth2AuthenticationStrategy) and connection string-based
authentication (handled by AzureEventHubsKafkaAutoConfiguration).

Co-authored-by: saragluna <[email protected]>

Author: Copilot

sdk/spring/spring-cloud-azure-autoconfigure/src/main/java/com/azure/spring/cloud/autoconfigure/implementation/kafka/authentication/KafkaOAuth2AuthenticationStrategy.java

@@ -29,8 +29,15 @@
 import static org.springframework.util.StringUtils.delimitedListToStringArray;
 
 /**
- * OAuth2 authentication strategy for Azure Event Hubs Kafka.
- * This strategy configures SASL/OAUTHBEARER authentication using Microsoft Entra ID.
+ * OAuth2 authentication strategy for Azure Event Hubs Kafka using Microsoft Entra ID.
+ * <p>
+ * This strategy configures SASL/OAUTHBEARER authentication for Azure Event Hubs Kafka clients
+ * using Microsoft Entra ID credentials (formerly Azure Active Directory).
+ * </p>
+ * <p>
+ * Note: This is different from connection string-based authentication which is handled by
+ * AzureEventHubsKafkaAutoConfiguration.
+ * </p>
  *
  * @since 6.1.0
  */

sdk/spring/spring-cloud-azure-autoconfigure/src/main/java/com/azure/spring/cloud/autoconfigure/implementation/kafka/authentication/package-info.java

@@ -21,7 +21,11 @@
  * 
  * <h3>OAuth2 Authentication (Microsoft Entra ID)</h3>
  * The {@code KafkaOAuth2AuthenticationStrategy} configures SASL/OAUTHBEARER authentication
- * for connecting to Azure Event Hubs using Microsoft Entra ID credentials.
+ * for connecting to Azure Event Hubs using Microsoft Entra ID credentials (formerly Azure Active Directory).
+ * <p>
+ * Note: This package only contains OAuth2/OAUTHBEARER authentication. Connection string-based
+ * authentication for Event Hubs is handled separately by {@code AzureEventHubsKafkaAutoConfiguration}.
+ * </p>
  * 
  * <p><b>Configuration Requirements:</b></p>
  * <ul>