Clarify bug report submission requests

[CasBex]

I just submitted a PR to ZMQ.jl and the CI resulted in the following (full details in the link).

Please submit a bug report with steps to reproduce this fault, and any error messages that follow (in their entirety). Thanks.
...

I know I'm the likely culprit behind the bug because I used unsafe operations but the message left me confused as to where to submit the report (libzmq, ZMQ.jl, JuliaLang...). I suggest to clarify that the bug should be submitted in this repository.

[vtjnash]

I'm not sure why you're saying it should always be submitted here. It looks like you introduced a bug into ZMQ.jl with zmq_poll, so you'd file a bug there

[CasBex]

I mean yes, I introduced a bug in ZMQ.jl in an unfinished PR, so I should definitely fix it there, but the code throwing that message is located here. To me it was completely unclear whether this came from the C library libzmq, ZMQ.jl or Julia so I needed to search the source code. Maybe the bugreport should not always be submitted here, but a bit more clarity would be nice anyway.

[Keno]

That error is an error of last resort when things get corrupted. We do not and cannot know whose fault it is at that point.