Fixes #17910: we didn't clearly explain that coredumps may exist without journal entries, and vice versa. Also, make the examples more concrete, and use '$' instead of '#' to avoid suggesting that running as root is required. The text is extended a bit in various places. In the description of systemd-coredump, the details of executor separation are split out to a separate subsection, since they are rather detailed and not necessary to understand for normal use.
System and Service Manager
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