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Update box-recursive.md (#241)

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* Update box-recursive.md

Adding Speaker Notes. This is a high-level guideline what to say, so we can settle on one explanation and review it.
This may be very obvious with the background in some languages, but be very non-obvious in languages that always
use references and never embed structs into structs.

* Fix wording

Co-authored-by: Andrew Walbran <qwandor@google.com>
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Igor Petruk 2023-01-23 12:54:06 +00:00 committed by GitHub
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src/std/box-recursive.md
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@ -30,3 +30,12 @@ fn main() {
`- - - - - - - - - - - - -' '- - - - - - - - - - - - - - - - - - - - - - - -'
```
<details>
If the `Box` was not used here and we attempted to embed a `List` directly into the `List`,
the compiler would not compute a fixed size of the struct in memory, it would look infinite.
`Box` solves this problem as it has the same size as a regular pointer and just points at the next
element of the `List` in the heap.
</details>