[tor-bugs] [Tor Bug Tracker & Wiki] Batch modify: #19305, #19306, #19304

[Tor Bug Tracker & Wiki]

Batch modification to #19305, #19306, #19304 by nickm:
keywords to prop256 dirauth, needs-proposal, tor-dos, tor-dos-designs
component to Core Tor/Tor
type to task
sponsor to SponsorU-can
milestone to Tor: 0.2.9.x-final

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Tickets URL: <https://trac.torproject.org/projects/tor/query?id=19305%2C19306%2C19304>
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