Change `jetstream::Error`'s `Display` message #4574

Job	Run time
check format (ubuntu-latest / nightly)	13s
test (ubuntu-latest / stable)	7m 25s
test (macos-latest / stable)	6m 42s
test (windows-latest / stable)	10m 52s
check docs (ubuntu-latest / stable)	33s
check feature flags (ubuntu-latest / stable)	14m 56s
check licenses (ubuntu-latest / stable)	24s
check linter (ubuntu-latest / stable)	43s
check minimal supported rust version (ubuntu-latest / msrv)	16s
check examples (ubuntu-latest / stable)	42s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	31s
check spelling (ubuntu-latest / nightly)	26s
	43m 43s

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