[Kaleidoscope] Fix a typo in Chapter 5.

llvm-svn: 246081
diff --git a/llvm/docs/tutorial/LangImpl5.rst b/llvm/docs/tutorial/LangImpl5.rst
index 7b8c29a..978bdcb 100644
--- a/llvm/docs/tutorial/LangImpl5.rst
+++ b/llvm/docs/tutorial/LangImpl5.rst
@@ -97,7 +97,7 @@
 
     /// IfExprAST - Expression class for if/then/else.
     class IfExprAST : public ExprAST {
-      std::unique<ExprAST> Cond, Then, Else;
+      std::unique_ptr<ExprAST> Cond, Then, Else;
 
     public:
       IfExprAST(std::unique_ptr<ExprAST> Cond, std::unique_ptr<ExprAST> Then,