Amend several typos in Kafka Wrapper doc. (apache#3387)

### Motivation
Kafka Wrapper doc minor improvement.

### Modifications
Amend several typos in Kafka Wrapper.

site2/docs/adaptors-kafka.md

@@ -9,12 +9,12 @@ Pulsar provides an easy option for applications that are currently written using
 
 ## Using the Pulsar Kafka compatibility wrapper
 
-In an existing application, change the regular Kafka client dependency and replace it with the Pulsar Kafka wrapper. Remove:
+In an existing application, change the regular Kafka client dependency and replace it with the Pulsar Kafka wrapper. Remove the following dependency in `pom.xml`:
 
 ```xml
 <dependency>
   <groupId>org.apache.kafka</groupId>
-  <artifactId>kakfa-clients</artifactId>
+  <artifactId>kafka-clients</artifactId>
   <version>0.10.2.1</version>
 </dependency>
 ```
@@ -48,7 +48,7 @@ unshaded pulsar kafka client wrapper.
 </dependency>
 ```
 
-When using this dependency, you need to construct producer using `org.apache.kafka.clients.producer.PulsarKafkaProducer`
+When using this dependency, you need to construct producers using `org.apache.kafka.clients.producer.PulsarKafkaProducer`
 instead of `org.apache.kafka.clients.producer.KafkaProducer` and `org.apache.kafka.clients.producer.PulsarKafkaConsumer` for consumers.
 
 ## Producer example
@@ -246,7 +246,7 @@ You can configure Pulsar authentication provider directly from the Kafka propert
 |:---------------------------------------|:--------|:---------------------------------------------------------------------------------------|
 | [`pulsar.producer.name`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ProducerConfiguration.html#setProducerName-java.lang.String-) | | Specify producer name |
 | [`pulsar.producer.initial.sequence.id`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ProducerConfiguration.html#setInitialSequenceId-long-) |  | Specify baseline for sequence id for this producer |
-| [`pulsar.producer.max.pending.messages`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ProducerConfiguration.html#setMaxPendingMessages-int-) | `1000` | Set the max size of the queue holding the messages pending to receive an acknowledgment from the broker.  |
+| [`pulsar.producer.max.pending.messages`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ProducerConfiguration.html#setMaxPendingMessages-int-) | `1000` | Set the max size of the queue holding the messages pending to receive an acknowledgment from the broker  |
 | [`pulsar.producer.max.pending.messages.across.partitions`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ProducerConfiguration.html#setMaxPendingMessagesAcrossPartitions-int-) | `50000` | Set the number of max pending messages across all the partitions  |
 | [`pulsar.producer.batching.enabled`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ProducerConfiguration.html#setBatchingEnabled-boolean-) | `true` | Control whether automatic batching of messages is enabled for the producer |
 | [`pulsar.producer.batching.max.messages`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ProducerConfiguration.html#setBatchingMaxMessages-int-) | `1000` | The maximum number of messages permitted in a batch |
@@ -257,6 +257,6 @@ You can configure Pulsar authentication provider directly from the Kafka propert
 | Config property                        | Default | Notes                                                                                  |
 |:---------------------------------------|:--------|:---------------------------------------------------------------------------------------|
 | [`pulsar.consumer.name`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ConsumerConfiguration.html#setConsumerName-java.lang.String-) | | Set the consumer name |
-| [`pulsar.consumer.receiver.queue.size`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ConsumerConfiguration.html#setReceiverQueueSize-int-) | 1000 | Sets the size of the consumer receive queue |
-| [`pulsar.consumer.total.receiver.queue.size.across.partitions`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ConsumerConfiguration.html#setMaxTotalReceiverQueueSizeAcrossPartitions-int-) | 50000 | Set the max total receiver queue size across partitons |
+| [`pulsar.consumer.receiver.queue.size`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ConsumerConfiguration.html#setReceiverQueueSize-int-) | 1000 | Set the size of the consumer receiver queue |
+| [`pulsar.consumer.total.receiver.queue.size.across.partitions`](http://pulsar.apache.org/api/client/org/apache/pulsar/client/api/ConsumerConfiguration.html#setMaxTotalReceiverQueueSizeAcrossPartitions-int-) | 50000 | Set the max total receiver queue size across partitions |