Fix Identify users page in docs

<p>Can't reach <a target="_blank" rel="noopener noreferrer nofollow" class="text-primary underline" href="https://quackback.io/docs/widget/identify-users">https://quackback.io/docs/widget/identify-users</a> due to REACT error. But since I need to debug another issue (Object { code: "VALIDATION_ERROR", message: "Invalid request body: ssoToken is required" }) accessing this resource could be quite essential.</p>