docs: fix broken link.

PR14889

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172046 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/GettingStarted.rst b/docs/GettingStarted.rst
index 5009d1c..322c355 100644
--- a/docs/GettingStarted.rst
+++ b/docs/GettingStarted.rst
@@ -467,6 +467,8 @@
 
   Binary release of the llvm-gcc-4.2 front end for a specific platform.
 
+.. _checkout:
+
 Checkout LLVM from Subversion
 -----------------------------