[Telemetry SWX] Make comment about closure compiler clear

Move a bit down comment about when closure compiler knows that input is
{!Object}.

Change-Id: Ia424d3ecce01e544c44f6e2728dca01e46dcde4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362924
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Mahmoud Gawad <mgawad@google.com>
Cr-Commit-Position: refs/heads/master@{#799587}

chromeos/components/telemetry_extension_ui/resources/trusted.js

@@ -313,11 +313,12 @@ class TelemetryProxy {
       return null;
     }
 
-    // After this closure compiler knows that input is {!Object}.
     if (typeof input !== 'object') {
       return input;
     }
 
+    // At this point, closure compiler knows that the input is {!Object}.
+
     // 1 rule: convert objects like { value: X } to X, where X is a number.
     if (Object.entries(input).length === 1 &&
         typeof input['value'] === 'number') {