docs: how to get core dump files #28826

Problem: Docs about how to obtain backtraces on Linux is not very
beginner-friendly; some users used to have difficulties in getting
stacktrace against Nvim crash.

For instance, the `core` dump file might not appear in the current
directory on Ubuntu systems with apport, and the current docs do not
fully cover such cases.

Solution: Add more hints about where core dump files can be found. For
example, on Ubuntu where apport is managing core dump files, users would
want to find them in `/var/lib/apport/coredump`.

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