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docs: clarify explicitly freeing heap allocated memory
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@ -1038,10 +1038,18 @@ impl<T: ?Sized, A: Allocator> Box<T, A> {
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/// use std::ptr;
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///
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/// let x = Box::new(String::from("Hello"));
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/// let p = Box::into_raw(x);
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/// let ptr = Box::into_raw(x);
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/// unsafe {
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/// ptr::drop_in_place(p);
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/// dealloc(p as *mut u8, Layout::new::<String>());
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/// ptr::drop_in_place(ptr);
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/// dealloc(ptr as *mut u8, Layout::new::<String>());
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/// }
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/// ```
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/// Note: This is equivalent to the following:
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/// ```
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/// let x = Box::new(String::from("Hello"));
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/// let ptr = Box::into_raw(x);
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/// unsafe {
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/// drop(Box::from_raw(ptr));
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/// }
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/// ```
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///
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