Set up intra-doc links

[sajattack]

Intra-doc links just hit stable rust. This allows us to make links in the docs, which would be very helpful for doc comments like this one:

/// Wait until display list has finished executing
///
/// # Parameters
///
/// - `mode`: What to wait for, one of `GuSyncMode`
/// - `behavior`: How to sync, one of `GuSyncBehavior`
///

If someone out there wants an easy way to get started contributing to rust-psp, this is it.

More info:
https://blog.rust-lang.org/2020/11/19/Rust-1.48.html#easier-linking-in-rustdoc
https://doc.rust-lang.org/stable/rustdoc/linking-to-items-by-name.html

[DuckEater54]

I think the crate needs more documentation in general. For example psp::sys::AudioInputParams has six variables, but only one of them has been named

[sajattack]

I think the crate needs more documentation in general. For example psp::sys::AudioInputParams has six variables, but only one of them has been named

The docs were pulled in through some bindgen hacks from the C PSPSDK. It's also tricky to document everything because we literally don't know what all the functions do. It's OS calls to Sony functions that haven't been fully reverse engineered.