Add the VM number to each VM title?

### Description of the modifications

I think the VMs are mainly called by their number, so their number should be easy to spot in the title.

Pinging @clatapie for discussion

### Useful links and references

_No response_

Review the VM examples and the existing five-comment discussion first, since no file or test is named in the issue. Identify where the VM titles are defined and confirm the intended numbering convention with the discussion; done means each relevant VM title visibly includes its number.

Written by the indexing model from the issue text.