(docs) add custom-action-icon slot

Author: antoine92190

README.md

@@ -593,7 +593,7 @@ Example:
 
 | <div style="width:230px">Slot</div> | Action                                                      | Data                                | Overridden slots                                                                                                   |
 | ----------------------------------- | ----------------------------------------------------------- | ----------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
-| `rooms-header`                      | Add a template on top of rooms list (above the search bar)  | -                                   | -                                                                                                                  |
+| `custom-action-icon`                | Add a custom icon inside the footer                         | -                                   | -                                                                                                                  |  | `rooms-header` | Add a template on top of rooms list (above the search bar) | - | - |
 | `room-list-item`                    | Replace the template of the room list items                 | `room`                              | `room-list-options`                                                                                                |
 | `room-list-options`                 | Replace the template of the list room options               | `room`                              | `room-list-options-icon`                                                                                           |
 | `room-header`                       | Replace the template of the room header                     | `room`, `typingUsers`, `userStatus` | `room-options`, `menu-icon`, `toggle-icon`                                                                         |