Fix Javadoc errors.

Author: ueshin

network/common/src/main/java/org/apache/spark/network/client/TransportClient.java

@@ -48,7 +48,7 @@
  * to perform this setup.
  *
  * For example, a typical workflow might be:
- * client.sendRPC(new OpenFile("/foo")) --> returns StreamId = 100
+ * client.sendRPC(new OpenFile("/foo")) --> returns StreamId = 100
  * client.fetchChunk(streamId = 100, chunkIndex = 0, callback)
  * client.fetchChunk(streamId = 100, chunkIndex = 1, callback)
  * ...

network/common/src/main/java/org/apache/spark/network/server/OneForOneStreamManager.java

@@ -29,7 +29,7 @@
 import org.apache.spark.network.buffer.ManagedBuffer;
 
 /**
- * StreamManager which allows registration of an Iterator<ManagedBuffer>, which are individually
+ * StreamManager which allows registration of an Iterator&lt;ManagedBuffer&gt;, which are individually
  * fetched as chunks by the client. Each registered buffer is one chunk.
  */
 public class OneForOneStreamManager extends StreamManager {

network/common/src/main/java/org/apache/spark/network/util/NettyUtils.java

@@ -92,7 +92,7 @@ public static ByteToMessageDecoder createFrameDecoder() {
     return new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 8, -8, 8);
   }
 
-  /** Returns the remote address on the channel or "<remote address>" if none exists. */
+  /** Returns the remote address on the channel or "&lt;remote address&gt;" if none exists. */
   public static String getRemoteAddress(Channel channel) {
     if (channel != null && channel.remoteAddress() != null) {
       return channel.remoteAddress().toString();