Other than doc updates, this just contains bytecodealliance/cap-std#235,
a fix for compilation errors on Rust nightly that look like this:
```
error[E0308]: mismatched types
--> cap-primitives/src/fs/via_parent/rename.rs:22:58
|
22 | let (old_dir, old_basename) = open_parent(old_start, &old_path)?;
| ^^^^^^^^^ expected struct `Path`, found opaque type
|
::: cap-primitives/src/rustix/fs/dir_utils.rs:67:48
|
67 | pub(crate) fn strip_dir_suffix(path: &Path) -> impl Deref<Target = Path> + '_ {
| ------------------------------ the found opaque type
|
= note: expected struct `Path`
found opaque type `impl Deref<Target = Path>`
```
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