fix typo

CppCoreGuidelines.md

@@ -3453,7 +3453,7 @@ It is often a good idea to express the invariant as an `Ensure` on the construct
 	};
 
 	Rec r1 {"Foo",7};
-	Rec r2 {"Bar};
+	Rec r2 {"Bar"};
 
 The `Rec2` constructor is redundant.
 Also, the default for `int` would be better done as a [member initializer](#Rc-in-class initializer).