spec: Merge prop305 into rend-spec-v3.txt

Now that legacy/trac#30924 (moved) was merged, we need to close prop305 and merge it in `rend-spec-v3.txt.

changed milestone to %Tor: 0.4.3.x-final in legacy/trac

added component::core tor/tor in Legacy / Trac milestone::Tor: 0.4.3.x-final in Legacy / Trac owner::dgoulet in Legacy / Trac points::0.2 in Legacy / Trac priority::medium in Legacy / Trac prop305 in Legacy / Trac resolution::fixed in Legacy / Trac reviewer::asn in Legacy / Trac severity::normal in Legacy / Trac sponsor::27-must in Legacy / Trac status::closed in Legacy / Trac tor-spec in Legacy / Trac type::task in Legacy / Trac labels

Branch: ticket32617_01

Trac:
Status: assigned to needs_review

Great! Merged!

Trac:
Status: needs_review to closed
Resolution: N/A to fixed

closed

changed time estimate to 1h 36m

moved from legacy/trac#32617 (moved)

added Task + 1 deleted label and removed 1 deleted label

added Specifications label and removed 1 deleted label