Remove duplicate link from toolchains doc page

../toolchains.html is the correct link. The other one 404s.

RELNOTES: None.
PiperOrigin-RevId: 210373019
diff --git a/src/main/java/com/google/devtools/build/docgen/templates/attributes/common/toolchains.html b/src/main/java/com/google/devtools/build/docgen/templates/attributes/common/toolchains.html
index 46b8214..1c7248b 100644
--- a/src/main/java/com/google/devtools/build/docgen/templates/attributes/common/toolchains.html
+++ b/src/main/java/com/google/devtools/build/docgen/templates/attributes/common/toolchains.html
@@ -3,7 +3,6 @@
 <p>
 The set of
 <a href="../toolchains.html">toolchains</a>
-<a href="toolchains.html">toolchains</a>
 this rule has access to.
 </p>