docs: fix bug 7628699

                   <h2>In-app Subscriptions with Trials</h2>

                   <p>You can now set up a <strong>free trial period</strong> for any Google Play in-app subscription, making it easy for users try your subscriber content before automatically converting to a full subscription. Free trials give you a new way to bring users into your products and engage them effectively. </p>

                   <p><a class="button"

href="http://dirkbd.mtv:8809/guide/google/play/billing/billing_subscriptions.html#trials">Read

href="{@docRoot}guide/google/play/billing/billing_subscriptions.html#trials">Read

more</a></p>

                   </div>                

                </li>