Minor typo in `#[doc]` attribute documentation

Hi there!
I was reading the [`#[doc]`](https://doc.rust-lang.org/rustdoc/the-doc-attribute.html) documentation, and came across the following typo:
```
#[doc(inline)}
```
There is a curly brace instead of a square bracket. It can be found at the very bottom of [`#[doc(no_inline)]`/`#[doc(inline)]`](https://doc.rust-lang.org/rustdoc/the-doc-attribute.html#docno_inlinedocinline).