Commits on Jun 24, 2020

1. Update Box::from_raw example to generalize better …

   I know very little about rust, so I saw this example and tried to generalize it by writing,
   ```
       let layout = Layout::new::<T>();
       let new_obj = unsafe {
           let ptr = alloc(layout) as *mut T;
           *ptr = obj;
           Box::from_raw(ptr)
       };
   ```
   for some more complicated `T`, which ended up crashing with SIGSEGV,
   because it tried to `drop_in_place` the previous object in `ptr` which is
   of course garbage. I also added a comment that explains why `.write`
   is used, but I think adding that comment is optional and may be too verbose
   here. I do however think that changing this example is a good idea to
   suggest the correct generalization. `.write` is also used in most of the rest
   of the documentation here, even if the example is `i32`, so it would additionally
   be more consistent.

   

   Keno committed Jun 24, 2020
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