finish tools docs

website/src/lib/docs/en/toolbar/time.mdx

@@ -5,10 +5,21 @@ title: Time
 <script>
     import { CalendarClock } from 'lucide-svelte';
     import Time from '$lib/components/toolbar/tools/Time.svelte';
+    import DocsNote from '$lib/components/docs/DocsNote.svelte';
 </script>
 
 # <CalendarClock size="24" class="inline-block" style="margin-bottom: 5px" /> { title }
 
+This tool allows you to change or add timestamps to a trace.
+You simply need to use the form shown below, and validate it when you are done.
+
 <div class="flex flex-row justify-center">
     <Time class="text-foreground p-3 border rounded-md shadow-lg" />
-</div>
+</div>
+
+When you edit the speed, the moving time is adapted accordingly in the form, and vice versa.
+Similarly, when you edit the start time, the end time is updated to keep the same total duration, and vice versa.
+
+<DocsNote>
+    When using this tool with existing timestamps, changing the time or speed will simply shift, stretch or compress them accordingly.
+</DocsNote>