Remove stale javadoc references to AsyncApi.

apis/oauth/src/main/java/org/jclouds/oauth/v2/OAuthApi.java

@@ -37,8 +37,6 @@ import org.jclouds.rest.annotations.Endpoint;
  * Usually this is not directly used by a client, which instead specifies
  * OAuthAuthenticator as a request filter, which in turn uses this class to
  * perform token requests.
- * 
- * @see OAuthAsyncApi
  */
 @Endpoint(Authentication.class)
 public interface OAuthApi extends Closeable {

apis/oauth/src/main/java/org/jclouds/oauth/v2/config/Authentication.java

@@ -26,7 +26,7 @@ import java.lang.annotation.Target;
 /**
  * Qualifies OAuth related resources, such as Endpoint.
  *
- * @see org.jclouds.oauth.v2.OAuthAsyncApi
+ * @see org.jclouds.oauth.v2.OAuthApi
  */
 @Retention(value = RetentionPolicy.RUNTIME)
 @Target(value = {ElementType.TYPE, ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD})