change link on book front page trpl -> book

diff --git a/src/doc/book/README.md b/src/doc/book/README.md
index 7acb7f835b8ddbab7f3398bbbe787c9d2e7906c9..565f143a291fb03fdb32bc6eb6dbb807fe5b0337 100644 (file)
--- a/src/doc/book/README.md
+++ b/src/doc/book/README.md
@@ -42,7 +42,6 @@ Copious cross-linking connects these parts together.
 ### Contributing
 
 The source files from which this book is generated can be found on
-[GitHub][trpl].
-
-[trpl]: https://github.com/rust-lang/rust/tree/master/src/doc/trpl
+[GitHub][book].
 
+[book]: https://github.com/rust-lang/rust/tree/master/src/doc/book