Added a comment: atomic/transactional upgrades

diff --git a/doc/bugs/upgrade_to_V8_fails/comment_1_ef44b98740b33d6a7cab0cc5caf4be15._comment b/doc/bugs/upgrade_to_V8_fails/comment_1_ef44b98740b33d6a7cab0cc5caf4be15._comment
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+[[!comment format=mdwn
+ username="Ilya_Shlyakhter"
+ avatar="http://cdn.libravatar.org/avatar/1647044369aa7747829c38b9dcc84df0"
+ subject="atomic/transactional upgrades"
+ date="2020-03-05T19:10:16Z"
+ content="""
+Related question: is [[git-annex-upgrade]] atomic, in the sense of restoring old state if an upgrade fails?
+"""]]