update usage events tracking section

docs/ecolyo/functionalities/usage_events_tracking.md

@@ -7,6 +7,7 @@ This section explains how the application is tracking usage events. Here are the
 ## Usage events collection
 
 Here are the list of collected usage event:
+
 | Category       | Type                           | Target         | Result     | Context               | Description                              |
 | -------------- | ------------------------------ | -------------- | ---------- | --------------------- | ---------------------------------------- |
 | Connection     | ConnectionEvent                |                |            | "desktop" or "mobile" | User connects to the application.        |