Update OpenAPI 3.1 Descriptions

Author: github-openapi-bot

descriptions-next/api.github.com/api.github.com.json

@@ -12,7 +12,8 @@
     "contact": {
       "name": "Support",
       "url": "https://support.github.com/contact?tags=dotcom-rest-api"
-    }
+    },
+    "x-github-plan": "api.github.com"
   },
   "tags": [
     {

descriptions-next/api.github.com/api.github.com.yaml

@@ -11,6 +11,7 @@ info:
   contact:
     name: Support
     url: https://support.github.com/contact?tags=dotcom-rest-api
+  x-github-plan: api.github.com
 tags:
 - name: actions
   description: Endpoints to manage GitHub Actions using the REST API.