docs: add missingkeyfunction to doctree, fix title

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@353399 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/index.rst b/docs/index.rst
index db8ea1c..8b3f70e 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -173,4 +173,5 @@
    AtomLLD
    WebAssembly
    windows_support
+   missingkeyfunction
    ReleaseNotes
diff --git a/docs/missingkeyfunction.rst b/docs/missingkeyfunction.rst
index 410c749..54ad325 100644
--- a/docs/missingkeyfunction.rst
+++ b/docs/missingkeyfunction.rst
@@ -1,5 +1,5 @@
-Missing Key Method
-==================
+Missing Key Function
+====================
 
 If your build failed with a linker error something like this::