Update README.md

diff --git a/src/librustc/infer/lexical_region_resolve/README.md b/src/librustc/infer/lexical_region_resolve/README.md
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--- a/src/librustc/infer/lexical_region_resolve/README.md
+++ b/src/librustc/infer/lexical_region_resolve/README.md
@@ -6,7 +6,7 @@
 > As of edition 2018, region inference is done using Non-lexical lifetimes,
 > which is described in the guide and [this RFC].
 
-[rustc guide]: https://rust-lang.github.io/rustc-guide/mir/borrowck.html
+[rustc guide]: https://rust-lang.github.io/rustc-guide/borrow_check/region_inference.html
 [this RFC]: https://github.com/rust-lang/rfcs/blob/master/text/2094-nll.md
 
 ## Terminology