rustdoc: word wrap CamelCase in the item list table

This is an alternative to ee6459d6521cf6a4c2e08b6e13ce3c6ce5d55ed0.
That is, it fixes the issue that affects the very long type names
in https://docs.rs/async-stripe/0.31.0/stripe/index.html#structs.

This is, necessarily, a pile of nasty heuristics.
We need to balance a few issues:

- Sometimes, there's no real word break.
  For example, `BTreeMap` should be `BTree<wbr>Map`,
  not `B<wbr>Tree<wbr>Map`.

- Sometimes, there's a legit word break,
  but the name is tiny and the HTML overhead isn't worth it.
  For example, if we're typesetting `TyCtx`,
  writing `Ty<wbr>Ctx` would have an HTML overhead of 50%.
  Line breaking inside it makes no sense.

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