message: update word for OpenApi Hub related info
diff: @@ -43,7 +43,7 @@ Otherwise your PR may be subject to ARM review requirements. Complete the follow
  - Adding a new service
  - Adding new API(s)
  - Adding a new API version
  - -[ ] To review changes efficiently, ensure you copy the existing version into the new directory structure for first commit and then push new changes, including version updates, in separate commits.
  + -[ ] To review changes efficiently, ensure you are using OpenAPIHub to initialize the PR for adding a new version. More details, refer to the [wiki](https://dev.azure.com/azure-sdk/internal/_wiki/wikis/internal.wiki/208/OpenAPI-Hub-Adding-new-API-version).
  - [ ] Ensure you've reviewed following [guidelines](https://aka.ms/rpguidelines) including [ARM resource provider contract](https://github.com/Azure/azure-resource-manager-rpc) and [REST guidelines](https://github.com/microsoft/api-guidelines/blob/vNext/azure/Guidelines.md). Estimated time (4 hours). This is required before you can request review from ARM API Review board.
  