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## Current Behavior
--graph stdout and --file stdout aren't documented. When printing graph
to stdout, its possible for some output to get missed.
## Expected Behavior
Existing flags are documented, and `--print` is more discoverable. We
await stdout finishing before exiting the program.
## Related Issue(s)
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merged. -->
Fixes#18689
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## Current Behavior
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`output-style` option's potential values are not explained.
## Expected Behavior
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add description to `output-style` option's potential values
## Related Issue(s)
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merged. -->
Fixes#20159
