Link “DST” to its definition

Being new to Rust I wasn't familiar with this acronym and found it hard to guess (the context of syntax trees biased me to reading it as a D-something Syntax Tree and trying to guess what the D was), hard to google (in retrospect googling "rust dst" does the job, but I thought it was an abstract structure thing, not Rust-specific), and hard to Github-search, because `dst` is commonly short for “destination” in code.

Alternatively `<abbr title="dynamically sized type">DST</abbr>` would be about as helpful.
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Gunnlaugur Thor Briem 2021-08-01 14:37:16 +00:00 committed by GitHub
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@ -110,7 +110,7 @@ FN@0..17
(significant amount of implementation work here was done by [CAD97](https://github.com/cad97)).
To reduce the amount of allocations, the GreenNode is a DST, which uses a single allocation for header and children. Thus, it is only usable behind a pointer
To reduce the amount of allocations, the GreenNode is a [DST](https://doc.rust-lang.org/reference/dynamically-sized-types.html), which uses a single allocation for header and children. Thus, it is only usable behind a pointer.
```
*-----------+------+----------+------------+--------+--------+-----+--------*