From: bors <bors@rust-lang.org>
Date: Thu, 12 Apr 2018 08:00:38 +0000 (+0000)
Subject: Auto merge of #5346 - derekdreery:package_id_docs, r=matklad
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Auto merge of #5346 - derekdreery:package_id_docs, r=matklad

Add docs

Just adds some docs matching what @matklad told me on irc :)
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4b1c1b7561eee379f8caa09f4d794481843419a5