Update one incorrect PR number in changelog (#4555)

* Update one incorrect PR number in changelog

Because of how #4345 was merged into #4344, the script that automatically
adds PR numbers to the changelog got the wrong PR number for the "Expose
`event.routeId` and `page.routeId`" feature. This manual change to 
the CHANGELOG.md file fixes that minor error.

* Update packages/kit/CHANGELOG.md

Fix link destination as well as link text

Co-authored-by: Ignatius Bagus <ignatius.mbs@gmail.com>

Co-authored-by: Ignatius Bagus <ignatius.mbs@gmail.com>

Author: rmunn

packages/kit/CHANGELOG.md

@@ -80,7 +80,7 @@
 
 - Populate fallback page when trailingSlash is "always" ([#4351](https://github.com/sveltejs/kit/pull/4351))
 
-* Expose `event.routeId` and `page.routeId` ([#4344](https://github.com/sveltejs/kit/pull/4344))
+* Expose `event.routeId` and `page.routeId` ([#4345](https://github.com/sveltejs/kit/pull/4345))
 
 - [breaking] remove fallthrough routes ([#4330](https://github.com/sveltejs/kit/pull/4330))