CI for Fix description for home_screen_displayed metric (#21697)

* Fix description for `home_screen_displayed` metric

The current description appears to be incorrect by my reading of the source.

* Update app/metrics.yaml

Co-authored-by: Gabriel Luong <gabriel.luong@gmail.com>

Co-authored-by: Will Lachance <wlachance@mozilla.com>
Co-authored-by: Gabriel Luong <gabriel.luong@gmail.com>

app/metrics.yaml

@@ -4996,9 +4996,9 @@ home_menu:
 home_screen:
   home_screen_displayed:
     type: event
-    description: The user clicked the settings option in home menu.
+    description: The home screen was displayed.
     bugs:
-      - https://github.com/mozilla-mobile/fenix/issues/18856
+      - https://github.com/mozilla-mobile/fenix/issues/18854
     data_reviews:
       - https://github.com/mozilla-mobile/fenix/pull/19025
       - https://github.com/mozilla-mobile/fenix/pull/19924#issuecomment-861423789