Add link to the edition guide.

rust-lang · Jan 29, 2019 · 84a89aa · 84a89aa
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diff --git a/src/doc/index.md b/src/doc/index.md
@@ -71,6 +71,10 @@ accomplishing various tasks.
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+## The Edition Guide
+
+[The Edition Guide](edition-guide/index.html) describes the Rust editions.
+
 ## The Rustc Book
 
 [The Rustc Book](rustc/index.html) describes the Rust compiler, `rustc`.