external.md: fix broken link

Change-Id: Ibc2362f1c40eea57fcd5fb42867ed9273cdcf40c
PiperOrigin-RevId: 235512756
diff --git a/site/docs/external.md b/site/docs/external.md
index c98f85d..dd25467 100644
--- a/site/docs/external.md
+++ b/site/docs/external.md
@@ -132,7 +132,7 @@
 
 By default, external dependencies are fetched as needed during `bazel build`. If
 you would like to disable this behavior or prefetch dependencies, use
-[`bazel fetch`](http://docs.bazel.build/user-manual.html#fetch).
+[`bazel fetch`](https://docs.bazel.build/versions/master/command-line-reference.html#commands).
 
 <a name="shadowing-dependencies"></a>
 ## Shadowing dependencies