Fix a comment.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113619 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/OperationKinds.h

@@ -54,7 +54,7 @@ enum CastKind {
   /// CK_ArrayToPointerDecay - Array to pointer decay.
   CK_ArrayToPointerDecay,
 
-  // CK_FunctionToPointerDecay - Function to pointer decay.
+  /// CK_FunctionToPointerDecay - Function to pointer decay.
   CK_FunctionToPointerDecay,
 
   /// CK_NullToMemberPointer - Null pointer to member pointer.