Expand isCredentialsUpdateSuggested docs.

package android.accounts;

import android.Manifest;

import android.annotation.SystemApi;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

     *

     * @param response to send the result back to the AccountManager, will never be null.

     * @param account the account to check, will never be null

     * @param statusToken a String of token to check if update of credentials is suggested.

     * @param statusToken a String of token which can be used to check the status of locally

     *            stored credentials and if update of credentials is suggested

     * @return a Bundle result or null if the result is to be returned via the response. The result

     *         will contain either:

     *         <ul>