[DOCUMENTATION][KAFKA] fix typo in kafka/OffsetRange.scala

this is to fix some typo in external/kafka/src/main/scala/org/apache/spark/streaming/kafka/OffsetRange.scala

Author: microwishing <wei.zhu@kaiyuandao.com>

Closes #10121 from microwishing/master.

external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaTestUtils.scala

@@ -151,7 +151,7 @@ private[kafka] class KafkaTestUtils extends Logging {
     }
   }
 
-  /** Create a Kafka topic and wait until it propagated to the whole cluster */
+  /** Create a Kafka topic and wait until it is propagated to the whole cluster */
   def createTopic(topic: String): Unit = {
     AdminUtils.createTopic(zkClient, topic, 1, 1)
     // wait until metadata is propagated

external/kafka/src/main/scala/org/apache/spark/streaming/kafka/OffsetRange.scala

@@ -20,7 +20,7 @@ package org.apache.spark.streaming.kafka
 import kafka.common.TopicAndPartition
 
 /**
- * Represents any object that has a collection of [[OffsetRange]]s. This can be used access the
+ * Represents any object that has a collection of [[OffsetRange]]s. This can be used to access the
  * offset ranges in RDDs generated by the direct Kafka DStream (see
  * [[KafkaUtils.createDirectStream()]]).
  * {{{