HADOOP-15271. Remove unicode multibyte characters from JavaDoc

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java

@@ -1649,7 +1649,7 @@ public abstract class FileSystem extends Configured implements Closeable {
   /**
    * Mark a path to be deleted when its FileSystem is closed.
    * When the JVM shuts down cleanly, all cached FileSystem objects will be
-   * closed automatically —these the marked paths will be deleted as a result.
+   * closed automatically. These the marked paths will be deleted as a result.
    *
    * If a FileSystem instance is not cached, i.e. has been created with
    * {@link #createFileSystem(URI, Configuration)}, then the paths will

hadoop-mapreduce-project/hadoop-mapreduce-examples/src/main/java/org/apache/hadoop/examples/pi/package.html

@@ -66,7 +66,7 @@ The table on the right are the results computed by distbbp.
     <li>The log files are available
         <a href="https://issues.apache.org/jira/secure/attachment/12408543/1e15log.zip">here</a>.</li>
     <li>The result was posted in
-        <a href="http://yahoohadoop.tumblr.com/post/98338598026/hadoop-computes-the-10-15-1st-bit-of-π">this YDN blog</a>.</li>
+        <a href="http://yahoohadoop.tumblr.com/post/98338598026/hadoop-computes-the-10-15-1st-bit-of-%CF%80">this YDN blog</a>.</li>
 
 </ul></li>
 <li>The second part of Row 15 (<tt>D3611</tt>)