Fix some sphinx doc errors.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@352887 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/NewLLD.rst b/docs/NewLLD.rst
index 79bdf90..d01fb53 100644
--- a/docs/NewLLD.rst
+++ b/docs/NewLLD.rst
@@ -307,3 +307,11 @@
   On Unix, your program is generally not guaranteed to be safe with ICF,
   although large programs happen to work correctly.
   LLD works fine with ICF for example.
+
+Other Info
+----------
+
+.. toctree::
+   :maxdepth: 1
+
+   missingkeyfunction