Use borderify name for borderify example extension (mdn#43805)

* Use borderify name for borderify example extension

beastify@mozilla.org seems to be a copy-paste from the second extension at
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Your_second_WebExtension

* Manifest version corrected

---------

Co-authored-by: rebloor <git@sherpa.co.nz>

Author: MeAmAnUsername

files/en-us/mozilla/add-ons/webextensions/your_first_webextension/index.md

@@ -28,7 +28,7 @@ Using a suitable [text editor](/en-US/docs/Learn_web_development/Howto/Tools_and
 
 ```json
 {
-  "manifest_version": 2,
+  "manifest_version": 3,
   "name": "Borderify",
   "version": "1.0",
 
@@ -40,7 +40,7 @@ Using a suitable [text editor](/en-US/docs/Learn_web_development/Howto/Tools_and
 
   "browser_specific_settings": {
     "gecko": {
-      "id": "beastify@mozilla.org",
+      "id": "borderify@mozilla.org",
       "data_collection_permissions": {
         "required": ["none"]
       }