fix(metadata): correct 'Backstge' typo in plugin docs links (#1985)

Fix 'Backstge docs' -> 'Backstage docs' in github-catalog-integration
and github-org-catalog-integration plugin definition files.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: kadel

catalog-entities/extensions/plugins/github-catalog-integration.yaml

@@ -22,7 +22,7 @@ metadata:
       url: https://docs.redhat.com/en/documentation/red_hat_developer_hub
     - title: Source Code
       url: https://github.com/backstage/backstage/tree/master/plugins/catalog-backend-module-github
-    - title: Backstge docs
+    - title: Backstage docs
       url: https://backstage.io/docs/reference/plugin-catalog-backend-module-github/
   tags:
     - software-catalog

catalog-entities/extensions/plugins/github-org-catalog-integration.yaml

@@ -20,7 +20,7 @@ metadata:
       url: https://docs.redhat.com/en/documentation/red_hat_developer_hub
     - title: Source Code
       url: https://github.com/backstage/backstage/tree/master/plugins/catalog-backend-module-github-org
-    - title: Backstge docs
+    - title: Backstage docs
       url: https://backstage.io/docs/reference/plugin-catalog-backend-module-github-org/
   tags:
     - software-catalog