docs: Fix broken links in docs with lychee (#42404)

Lychee is a [Rust based](https://lychee.cli.rs) async parallel link
checker.

I ran it against the codebase to suss out stale links and fixed those
up.

There's currently 2 remaining cases that I don't know how to resolve:

1. https://flathub.org/apps/dev.zed.Zed - nginx is giving a 502 bad
gateway
2.
https://github.com/zed-industries/zed/actions/workflows/ci.yml/badge.svg
- I don't want to mess with the CI pipeline in this PR.

Once again, I'll punt to the Docs Czar to see if this gets incorporated
into CI later.

---

## Running `lychee` locally:

```
cargo binstall -y lychee
lychee .
```

---
Release Notes:

- N/A

Signed-off-by: mrg <miguelraz@ciencias.unam.mx>

docs/src/development/release-notes.md

@@ -10,7 +10,7 @@ Release Notes:
 - N/A _or_ Added/Fixed/Improved ...
 ```
 
-On Wednesdays, we run a [`get-preview-channel-changes`](https://github.com/zed-industries/zed/blob/main/script/get-preview-channel-changes) script that scrapes `Release Notes` lines from pull requests landing in preview, as documented in our [Release](https://zed.dev/docs/development/releases) docs.
+On Wednesdays, we run a [`get-preview-channel-changes`](https://github.com/zed-industries/zed/blob/main/script/get-preview-channel-changes) script that scrapes `Release Notes` lines from pull requests landing in preview, as documented in our [Release](https://zed.dev/docs/development/release-notes) docs.
 
 The script outputs everything below the `Release Notes` line, including additional data such as the pull request author (if not a Zed team member) and a link to the pull request.
 If you use `N/A`, the script skips your pull request entirely.