Doc fixes: Fix format and other small errors in config documentation

clients/src/main/java/org/apache/kafka/clients/producer/ProducerConfig.java

@@ -281,22 +281,20 @@ public class ProducerConfig extends AbstractConfig {
 
     /** <code>partitioner.class</code> */
     public static final String PARTITIONER_CLASS_CONFIG = "partitioner.class";
-    private static final String PARTITIONER_CLASS_DOC = "A class to use to determine which partition to be send to when produce the records. Available options are:" +
-        "<ul>" +
-            "<li>If not set, the default partitioning logic is used. " +
-        "This strategy will try sticking to a partition until at least " + BATCH_SIZE_CONFIG + " bytes is produced to the partition. It works with the strategy:" +
-                "<ul>" +
-                    "<li>If no partition is specified but a key is present, choose a partition based on a hash of the key</li>" +
-                    "<li>If no partition or key is present, choose the sticky partition that changes when at least " + BATCH_SIZE_CONFIG + " bytes are produced to the partition.</li>" +
-                "</ul>" +
+    private static final String PARTITIONER_CLASS_DOC = "Determines which partition to send a record to when records are produced. Available options are:" +
+            "<ul>" +
+            "<li>If not set, the default partitioning logic is used. " + 
+            "This strategy send records to a partition until at least " + BATCH_SIZE_CONFIG + " bytes is produced to the partition. It works with the strategy:" + 
+            "<p> 1) If no partition is specified but a key is present, choose a partition based on a hash of the key." +
+            "<p> 2) If no partition or key is present, choose the sticky partition that changes when at least " + BATCH_SIZE_CONFIG + " bytes are produced to the partition." +
             "</li>" +
-            "<li><code>org.apache.kafka.clients.producer.RoundRobinPartitioner</code>: This partitioning strategy is that " +
-        "each record in a series of consecutive records will be sent to a different partition(no matter if the 'key' is provided or not), " +
-        "until we run out of partitions and start over again. Note: There's a known issue that will cause uneven distribution when new batch is created. " +
-        "Please check KAFKA-9965 for more detail." +
+            "<li><code>org.apache.kafka.clients.producer.RoundRobinPartitioner</code>: A partitioning strategy where " +
+            "each record in a series of consecutive records is sent to a different partition, regardless of whether the 'key' is provided or not, " +
+            "until partitions run out and the process starts over again. Note: There's a known issue that will cause uneven distribution when a new batch is created. " +
+            "See KAFKA-9965 for more detail." +
             "</li>" +
-        "</ul>" +
-        "<p>Implementing the <code>org.apache.kafka.clients.producer.Partitioner</code> interface allows you to plug in a custom partitioner.";
+            "</ul>" +
+            "<p>Implementing the <code>org.apache.kafka.clients.producer.Partitioner</code> interface allows you to plug in a custom partitioner.";
 
     /** <code>interceptor.classes</code> */
     public static final String INTERCEPTOR_CLASSES_CONFIG = "interceptor.classes";