[fix][doc] Refine ClientBuilder#memoryLimit and ConsumerBuilder#autoS…

…caledReceiverQueueSizeEnabled javadoc (apache#23687)

pulsar-client-api/src/main/java/org/apache/pulsar/client/api/ClientBuilder.java

@@ -439,9 +439,8 @@ ClientBuilder authentication(String authPluginClassName, Map<String, String> aut
     ClientBuilder tlsProtocols(Set<String> tlsProtocols);
 
     /**
-     * Configure a limit on the amount of direct memory that will be allocated by this client instance.
-     * <p>
-     * <b>Note: at this moment this is only limiting the memory for producers.</b>
+     * Configure a limit on the amount of direct memory that will be allocated by this client instance
+     * <i>(default: 64 MB)</i>.
      * <p>
      * Setting this to 0 will disable the limit.
      *

pulsar-client-api/src/main/java/org/apache/pulsar/client/api/ConsumerBuilder.java

@@ -884,13 +884,16 @@ public interface ConsumerBuilder<T> extends Cloneable {
 
     /**
      * If this is enabled, the consumer receiver queue size is initialized as a very small value, 1 by default,
-     * and will double itself until it reaches the value set by {@link #receiverQueueSize(int)}, if and only if:
+     * and will double itself until it reaches either the value set by {@link #receiverQueueSize(int)} or the client
+     * memory limit set by {@link ClientBuilder#memoryLimit(long, SizeUnit)}.
+     *
+     * <p>The consumer receiver queue size will double if and only if:
      * <p>1) User calls receive() and there are no messages in receiver queue.
      * <p>2) The last message we put in the receiver queue took the last space available in receiver queue.
      *
-     * This is disabled by default and currentReceiverQueueSize is initialized as maxReceiverQueueSize.
+     * <p>This is disabled by default and currentReceiverQueueSize is initialized as maxReceiverQueueSize.
      *
-     * The feature should be able to reduce client memory usage.
+     * <p>The feature should be able to reduce client memory usage.
      *
      * @param enabled whether to enable AutoScaledReceiverQueueSize.
      */