MINOR: Fix JavaDocs warnings (#6435)

Fix JavaDocs Warning
Reviewers: uozhang Wang <wangguoz@gmail.com>,  Bill Bejeck <bbejeck@gmail.com>

clients/src/main/java/org/apache/kafka/common/config/ConfigDef.java

@@ -53,7 +53,7 @@ import java.util.regex.Pattern;
  * defs.define("config_with_validator", Type.INT, 42, Range.atLeast(0), "Configuration with user provided validator.");
  * defs.define("config_with_dependents", Type.INT, "Configuration with dependents.", "group", 1, "Config With Dependents", Arrays.asList("config_with_default","config_with_validator"));
  *
- * Map<String, String> props = new HashMap<&gt();
+ * Map<String, String> props = new HashMap<>();
  * props.put("config_with_default", "some value");
  * props.put("config_with_dependents", "some other value");
  *
@@ -1133,7 +1133,7 @@ public class ConfigDef {
      * If <code>dynamicUpdateModes</code> is non-empty, a "Dynamic Update Mode" column
      * will be included n the table with the value of the update mode. Default
      * mode is "read-only".
-     * @param dynamicUpdateModes Config name -> update mode mapping
+     * @param dynamicUpdateModes Config name -&gt; update mode mapping
      */
     public String toHtmlTable(Map<String, String> dynamicUpdateModes) {
         boolean hasUpdateModes = !dynamicUpdateModes.isEmpty();

clients/src/main/java/org/apache/kafka/common/security/oauthbearer/OAuthBearerExtensionsValidatorCallback.java

@@ -76,7 +76,7 @@ public class OAuthBearerExtensionsValidatorCallback implements Callback {
     }
 
     /**
-     * @return An immutable {@link Map} consisting of the name->error messages of extensions which failed validation
+     * @return An immutable {@link Map} consisting of the name->error messages of extensions which failed validation
      */
     public Map<String, String> invalidExtensions() {
         return Collections.unmodifiableMap(invalidExtensions);

streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java

@@ -155,23 +155,23 @@ public class KafkaStreams implements AutoCloseable {
      *
      * <pre>
      *                 +--------------+
-     *         +<----- | Created (0)  |
+     *         +&lt;----- | Created (0)  |
      *         |       +-----+--------+
      *         |             |
      *         |             v
      *         |       +----+--+------+
      *         |       | Re-          |
-     *         +<----- | Balancing (1)| -------->+
+     *         +&lt;----- | Balancing (1)| --------&gt;+
      *         |       +-----+-+------+          |
      *         |             | ^                 |
      *         |             v |                 |
      *         |       +--------------+          v
-     *         |       | Running (2)  | -------->+
+     *         |       | Running (2)  | --------&gt;+
      *         |       +------+-------+          |
      *         |              |                  |
      *         |              v                  |
      *         |       +------+-------+     +----+-------+
-     *         +-----> | Pending      |<--- | Error (5)  |
+     *         +-----&gt; | Pending      |&lt;--- | Error (5)  |
      *                 | Shutdown (3) |     +------------+
      *                 +------+-------+
      *                        |

streams/src/main/java/org/apache/kafka/streams/StreamsConfig.java

@@ -102,7 +102,7 @@ import static org.apache.kafka.common.requests.IsolationLevel.READ_COMMITTED;
  * When increasing {@link ProducerConfig#MAX_BLOCK_MS_CONFIG} to be more resilient to non-available brokers you should also
  * increase {@link ConsumerConfig#MAX_POLL_INTERVAL_MS_CONFIG} using the following guidance:
  * <pre>
- *     max.poll.interval.ms > max.block.ms
+ *     max.poll.interval.ms &gt; max.block.ms
  * </pre>
  *
  *