Tip: A good part of microsoft documentation is now hosted on github... you may want to have a look at the revision history there and try to find the deleted doc

Tip: A good part of microsoft documentation is now hosted on github... you may want to have a look at the revision history there and try to find the deleted docs this way (for example this is the repository for azure bot: https://github.com/MicrosoftDocs/bot-docs/tree/live/articles https://github.com/MicrosoftDocs/bot-docs/tree/live/articles ).