Fix test failures

Author: nagisa

src/doc/unstable-book/src/SUMMARY.md

@@ -113,6 +113,7 @@
 - [loop_break_value](loop-break-value.md)
 - [macro_reexport](macro-reexport.md)
 - [main](main.md)
+- [manually_drop](manually-drop.md)
 - [map_entry_recover_keys](map-entry-recover-keys.md)
 - [mpsc_select](mpsc-select.md)
 - [n16](n16.md)

src/doc/unstable-book/src/manually-drop.md

@@ -10,10 +10,9 @@
 
 #![feature(core_intrinsics)]
 
-use std::intrinsics::{init, forget};
+use std::intrinsics::{init};
 
 // Test that the `forget` and `init` intrinsics are really unsafe
 pub fn main() {
     let stuff = init::<isize>(); //~ ERROR call to unsafe function requires unsafe
-    forget(stuff);             //~ ERROR call to unsafe function requires unsafe
 }