[docs] Use correct ending quotes.

llvm-svn: 348947
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index fec3b7f..ea879a5 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -5116,7 +5116,7 @@
 
 This metadata disables all optional loop transformations unless
 explicitly instructed using other transformation metdata such as
-``llvm.loop.unroll.enable''. That is, no heuristic will try to determine
+``llvm.loop.unroll.enable``. That is, no heuristic will try to determine
 whether a transformation is profitable. The purpose is to avoid that the
 loop is transformed to a different loop before an explicitly requested
 (forced) transformation is applied. For instance, loop fusion can make