Fix javadoc

Author: Danny Becker

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java

@@ -1564,11 +1564,17 @@ public long getMostRecentCheckpointTxId() {
   }
 
   /**
+   * Given a NameNodeFile type, retrieve the latest txid for that file or
+   * {@link HdfsServerConstants::INVALID_TXID} if the file does not exist
+   *
+   * @param nnf The NameNodeFile type to retrieve the latest txid from.
    * @return the latest txid for the NameNodeFile type, or
-   * {@link HdfsServerConstants::INVALID_TXID}if there is no FSImage file of the
-   * type requested.
+   * {@link HdfsServerConstants::INVALID_TXID} if there is no FSImage file of
+   * the type requested
+   * @throws IOException
    */
-  public long getMostRecentNameNodeFileTxId(NameNodeFile nnf) throws IOException {
+  public long getMostRecentNameNodeFileTxId(NameNodeFile nnf)
+      throws IOException {
     final FSImageStorageInspector inspector =
         new FSImageTransactionalStorageInspector(EnumSet.of(nnf));
     storage.inspectStorageDirs(inspector);