Update examples.

Author: m-ou-se

src/destructors.md

@@ -395,7 +395,7 @@ Here are some examples where expressions have extended temporary scopes:
 let x = &temp();
 let x = &temp() as &dyn Send;
 let x = (&*&temp(),);
-let x = { [Some { 0: &temp(), }] };
+let x = { [Some(&temp()) ] };
 let ref x = temp();
 let ref x = *&temp();
 # x;
@@ -410,7 +410,7 @@ Here are some examples where expressions don't have extended temporary scopes:
 // The temporary that stores the result of `temp()` only lives until the
 // end of the let statement in these cases.
 
-let x = Some(&temp());         // ERROR
+let x = std::convert::identity(&temp()); // ERROR
 let x = (&temp()).use_temp();  // ERROR
 # x;
 ```