Auto merge of #5443 - rtsuk:update-doc-env-var, r=alexcrichton
authorbors <bors@rust-lang.org>
Mon, 30 Apr 2018 18:19:47 +0000 (18:19 +0000)
committerbors <bors@rust-lang.org>
Mon, 30 Apr 2018 18:19:47 +0000 (18:19 +0000)
commit0d377b6f3428fd12da0be31871b17d2e3e2fc6cd
tree39b08c49256f3cedb53a92e055e83901e138bc7a
parent4963d884a4f39371b31cccd4db28297cdbeb24b5
parentce8fd49520a1e7752c69c2f90a013c9120db78e3
Auto merge of #5443 - rtsuk:update-doc-env-var, r=alexcrichton

Update documentation on config via environment variables

Use source replacement as a specific example of the kind
of configuration feature that cannot currently be set by
environmental variables.