While looking over some recent support requests for individuals, and rereading FAQ #16: How do I delete/undelete my journal or community? for clarity, I noticed that the FAQ mentions that a user needs to switch before (un)deleting a community, but not that the user may need to log in with the username and password of the deleted journal he or she is hoping to undelete. A few users seemed to be logged in to their current journal while attempting to undelete another journal, and some appeared to try to undelete without logging in at all.
So, a proposal in wording for the opening FAQ details:
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You can delete or undelete your journal at the Account Status page. Before undeleting a personal journal, you will need to ensure that you have logged in with the username and password of the journal you wish to undelete. Before deleting or undeleting a community you maintain, you will need to select your community from the Work as user menu and click the Switch button.
You are the only person who can delete your journal. LiveJournal staff and volunteers cannot delete it for you.
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Obviously, the sentence "Before undeleting a personal journal, you will need to ensure that you have logged in with the username and password of the journal you wish to undelete." could be moved to the end of that first paragraph, or it could be rewritten to say something like, "Before undeleting a personal journal, you may/will/[etc] need to log in with the username and password of the journal you wish to undelete." or perhaps say something about logging out and logging back in as a different user.
[Topic shift: Many thanks to
burr86 for the LiveJournal FAQ Elements of Style entry. I've put that into my memories and bookmarked it to refer to when writing support entries.] 