docs: fix numbering in middleware docs (#40276)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm lint`
- [ ] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

docs/advanced-features/middleware.md

@@ -93,9 +93,9 @@ export const config = {
 Configured matchers:
 
 1. MUST start with `/`
-1. can include named parameters: `/about/:path` matches `/about/a` and `/about/b` but not `/about/a/c`
-1. can have modifiers on named parameters (starting with `:`): `/about/:path*` matches `/about/a/b/c` because `*` is _zero or more_. `?` is _zero or one_ and `+` _one or more_
-1. can use regular expression enclosed in parenthesis: `/about/(.*)` is the same as `/about/:path*`
+2. Can include named parameters: `/about/:path` matches `/about/a` and `/about/b` but not `/about/a/c`
+3. Can have modifiers on named parameters (starting with `:`): `/about/:path*` matches `/about/a/b/c` because `*` is _zero or more_. `?` is _zero or one_ and `+` _one or more_
+4. Can use regular expression enclosed in parenthesis: `/about/(.*)` is the same as `/about/:path*`
 
 Read more details on [path-to-regexp](https://github.com/pillarjs/path-to-regexp#path-to-regexp-1) documentation.