From: bors <bors@rust-lang.org>
Date: Sun, 13 Aug 2017 12:40:53 +0000 (+0000)
Subject: Auto merge of #4402 - bluss:doc-rustdocflags, r=alexcrichton
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Auto merge of #4402 - bluss:doc-rustdocflags, r=alexcrichton

Document `RUSTDOCFLAGS`

Documentation for this environment variable was missing. It's supported in stable releases of Rust already.
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668d55cc6d54c7e9635c924c252621f5e6664e00