[doc] Add back heading to index.md

rust-lang · Sep 1, 2017 · 11f1443 · 11f1443
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commit 11f1443
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diff --git a/src/doc/index.md b/src/doc/index.md
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 % Cargo, Rust’s Package Manager
 
+# Installing
+
 ### Install Stable Rust and Cargo
 
 The easiest way to get Cargo is to get the current stable release of [Rust] by