The API list in the OpenStack CPI documentation is outdated

[kei-yamazaki]

Currently, the list of APIs mentioned in the OpenStack API Calls documentation seems outdated and does not reflect the latest developments.

In particular, regarding the OpenStack Cinder service, the API version 3 (Cinder v3) is now widely used and includes new features and improvements. However, this part is not reflected in the documentation, creating a situation where users cannot make appropriate settings or use based on the latest information.

If this document is already out of the maintenance scope, it might be better to remove the file or take similar actions to avoid confusion.