[release-12.1.0] Docs: Update actions with variables (#108151)

Co-authored-by: Adela Almasan <88068998+adela-almasan@users.noreply.github.com>

docs/sources/shared/visualizations/datalink-options-2.md

@@ -26,6 +26,7 @@ For each action, define the following API call settings:
 | Confirmation message | A descriptive prompt to confirm or cancel the action. |
 | Method               | Select from **POST**, **PUT**, or **GET**. |
 | URL                  | The request URL.</p><p>To add a variable, click in the **URL** field and enter `$` or press Ctrl+Space or Cmd+Space to see a list of available variables. |
+| Variables            | **Key** and **Name** pairs with a type selection. Click the **+** icon to add as many variables as you need. To add a variable to the request, prefix the key with `$`. You can set the values for the variables when performing an action. |
 | Query parameters     | **Key** and **Value** pairs. Click the **+** icon to add as many key/value pairs as you need. |
 | Headers              | Comprised of **Key** and **Value** pairs and a **Content-Type**.</p><p>Click the **+** icon to add as many key/value pairs as you need. |
 | Content-Type         | Select from the following: **application/json**, **text/plain**, **application/XML**, and **application/x-www-form-urlencoded**. |

docs/sources/shared/visualizations/datalink-options-3.md

@@ -28,6 +28,7 @@ For each action, define the following API call settings:
 | Confirmation message | A descriptive prompt to confirm or cancel the action. |
 | Method               | Select from **POST**, **PUT**, or **GET**. |
 | URL                  | The request URL.</p><p>To add a variable, click in the **URL** field and enter `$` or press Ctrl+Space or Cmd+Space to see a list of available variables. |
+| Variables            | **Key** and **Name** pairs with a type selection. Click the **+** icon to add as many variables as you need. To add a variable to the request, prefix the key with `$`. You can set the values for the variables when performing an action. |
 | Query parameters     | **Key** and **Value** pairs. Click the **+** icon to add as many key/value pairs as you need. |
 | Headers              | Comprised of **Key** and **Value** pairs and a **Content-Type**.</p><p>Click the **+** icon to add as many key/value pairs as you need. |
 | Content-Type         | Select from the following: **application/json**, **text/plain**, **application/XML**, and **application/x-www-form-urlencoded**. |