Addition of missing step in Jira GPT Action entry (openai#1328)

Author: emran-binhasan

examples/chatgpt/gpt_actions_library/gpt_action_jira.ipynb

@@ -450,7 +450,21 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "3. <b>Application Client ID/Secret</b>: The next step is to locate the **Client ID** and **Secret** for enabling secure authentication between ChatGPT and Jira. We can find these values by clicking on **Settings** in the sidebar and scrolling down to **Authentication Details**. \n",
+    "3. <b>Configure Placeholder Callback URL</b>: In order to complete the following step and obtain a **Client ID** and **Secret** for enabling secure authentication between ChatGPT and Jira, we first need to add a placeholder callback URL. We can achieve this by clicking on **Authorization** in the sidebar, and **Configure** next to **OAuth 2.0 (3LO)**. From here simply enter a placeholder URL and click **Save Changes**.\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "![gptactions_jira_placeholder.png](../../../images/gptactions_jira_placeholder.png)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "4. <b>Application Client ID/Secret</b>: The next step is to locate the **Client ID** and **Secret** for enabling secure authentication between ChatGPT and Jira. We can find these values by clicking on **Settings** in the sidebar and scrolling down to **Authentication Details**. \n",
     "\n",
     "      Keep this page open as we will require these values in the next stage of configuration!"
    ]