HADOOP-18404. Fix broken link to wiki help page in org.apache.hadoop.util.Shell (#4718). Contributed by Paul King.

Signed-off-by: Ayush Saxena <ayushsaxena@apache.org>

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Shell.java

@@ -60,7 +60,7 @@ public abstract class Shell {
    * {@value}
    */
   private static final String WINDOWS_PROBLEMS =
-      "https://wiki.apache.org/hadoop/WindowsProblems";
+      "https://cwiki.apache.org/confluence/display/HADOOP2/WindowsProblems";
 
   /**
    * Name of the windows utils binary: {@value}.