Update torbrowser import documentation
Following this commit, I think the last part of https://tails.boum.org/contribute/release_process/tor-browser/ should go away?
commit 05db5aaa114245af4211a19438e4d442b058d617 Author: intrigeri <firstname.lastname@example.org> Date: Sun Nov 10 09:54:03 2019 +0000 htpdate: stop sending User-Agent that fakes Tor Browser (refs: tails/tails#12023) As decided on the "[Tails-dev] Faking htpdate user agent worth it?" thread in December 2016.
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