Clarify documentation of exceptions in RepositoryResolver

Change-Id: Idf805f76f24bfa1f3552366197e0ed4e45cb2b74

org.eclipse.jgit/src/org/eclipse/jgit/transport/resolver/RepositoryResolver.java

@@ -76,11 +76,12 @@ public interface RepositoryResolver<C> {
 	 *             the repository does not exist or the name is incorrectly
 	 *             formatted as a repository name.
 	 * @throws ServiceNotAuthorizedException
-	 *             the repository exists, but HTTP access is not allowed for the
-	 *             current user.
+	 *             the repository may exist, but HTTP access is not allowed
+	 *             without authentication, i.e. this corresponds to an HTTP 401
+	 *             Unauthorized.
 	 * @throws ServiceNotEnabledException
-	 *             the repository exists, but HTTP access is not allowed on the
-	 *             target repository, by any user.
+	 *             the repository may exist, but HTTP access is not allowed on the
+	 *             target repository, for the current user.
 	 */
 	Repository open(C req, String name) throws RepositoryNotFoundException,
 			ServiceNotAuthorizedException, ServiceNotEnabledException;