[libc++] Fix link to bug tracker

NOKEYCHECK=True
GitOrigin-RevId: e6d7b2f0de1fca60d1e38557fc912ac4f44ad845
diff --git a/docs/index.rst b/docs/index.rst
index a03124b..09ea008 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -157,7 +157,7 @@
 
 A full list of currently open libc++ bugs can be `found here`__.
 
-.. __:  https://github.com/llvm/llvm-project/issues?q=label%3Alibc%2B%2B
+.. __:  https://github.com/llvm/llvm-project/labels/libc%2B%2B
 
 
 Design Documents