Add missing @since tags

Change-Id: Ia657e46b9abc8c8640f63f6ff579b2f8f2b01de4

org.eclipse.jgit/src/org/eclipse/jgit/lib/RefDatabase.java

@@ -199,6 +199,7 @@ public abstract class RefDatabase {
 	/**
 	 * @return if the database performs {@code newBatchUpdate()} as an atomic
 	 *         transaction.
+	 * @since 3.6
 	 */
 	public boolean performsAtomicTransactions() {
 		return false;

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

@@ -1254,7 +1254,10 @@ public abstract class BaseReceivePack {
 		}
 	}
 
-	/** @return if any commands have been rejected so far. */
+	/**
+	 * @return if any commands have been rejected so far.
+	 * @since 3.6
+	 */
 	protected boolean anyRejects() {
 		for (ReceiveCommand cmd : commands) {
 			if (cmd.getResult() != Result.NOT_ATTEMPTED && cmd.getResult() != Result.OK)
@@ -1263,7 +1266,10 @@ public abstract class BaseReceivePack {
 		return false;
 	}
 
-	/** Set the result to fail for any command that was not processed yet. */
+	/**
+	 * Set the result to fail for any command that was not processed yet.
+	 * @since 3.6
+	 */
 	protected void failPendingCommands() {
 		for (ReceiveCommand cmd : commands) {
 			if (cmd.getResult() == Result.NOT_ATTEMPTED)