[NFX] Fix language reference title declaration
llvm-svn: 351644
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 5600d2e..0843bf5 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -5067,7 +5067,7 @@
!0 = !{i64 (i64, i64)* @add, i64 (i64, i64)* @sub}
'``callback``' Metadata
-^^^^^^^^^^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^^^^^^^^^
``callback`` metadata may be attached to a function declaration, or definition.
(Call sites are excluded only due to the lack of a use case.) For ease of