Add / fix @since tags

Change-Id: I1e5bea968b3c79df4f600b75fde5b547ebadde36
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/DescribeCommand.java

@@ -68,7 +68,7 @@
 /**
  * Given a commit, show the most recent tag that is reachable from a commit.
  *
- * @since 3.1
+ * @since 3.2
  */
 public class DescribeCommand extends GitCommand<String> {
 	private final RevWalk w;

org.eclipse.jgit/src/org/eclipse/jgit/api/Git.java

@@ -668,7 +668,7 @@ public NameRevCommand nameRev() {
 	 * commit in terms of the nearest git tag.
 	 *
 	 * @return a {@link DescribeCommand}.
-	 * @since 3.1
+	 * @since 3.2
 	 */
 	public DescribeCommand describe() {
 		return new DescribeCommand(repo);

org.eclipse.jgit/src/org/eclipse/jgit/transport/ServiceMayNotContinueException.java

@@ -77,6 +77,7 @@ public ServiceMayNotContinueException(String msg) {
 	 *            be shown to an end-user.
 	 * @param cause
 	 *            the cause of the exception.
+	 * @since 3.2
 	 */
 	public ServiceMayNotContinueException(String msg, Throwable cause) {
 		super(msg);
@@ -88,6 +89,7 @@ public ServiceMayNotContinueException(String msg, Throwable cause) {
 	 *
 	 * @param cause
 	 *            the cause of the exception.
+	 * @since 3.2
 	 */
 	public ServiceMayNotContinueException(Throwable cause) {
 		this(JGitText.get().internalServerError, cause);