Fix GitDateFormatter javadoc.

Change-Id: I627bdc387754a626ed8b1839494c05dfd5950d11
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/util/GitDateFormatter.java

@@ -52,7 +52,9 @@ import org.eclipse.jgit.lib.PersonIdent;
 
 /**
  * A utility for formatting dates according to the Git log.date formats plus
- * extensions. <p< The enum {@link Format} defines the available types
+ * extensions.
+ * <p>
+ * The enum {@link Format} defines the available types.
  */
 public class GitDateFormatter {