docs: reporting-issues.rst: explain how to decode stack traces

Replace placeholder text about decoding stack traces with a section that
properly describes what a typical user should do these days. To make
it works for them, add a paragraph in an earlier section to ensure
people build their kernels with everything that's needed to decode stack
traces later.

Signed-off-by: Thorsten Leemhuis <[email protected]>
Reviewed-by: Qais Yousef <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

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