The GitHub UI shows apparently the name of the template at
https://github.com/lowRISC/ibex/issues/new/choose, which I thought was
just an internal identifier. Use the longer-form version there as well.
Add two issue templates to the GitHub project: one for questions, and
one for reporting bugs. These templates are not mandatory, users can
freely change them, or get a blank issue template instead.
To avoid having too much description/example text in the final issue the
instructions are written in HTML comments (which is not beautiful, but
should do the trick and seen commonly in projects).