doc: remove generate changelog section from release-process.md

We haven't done this since 22.0. It's not clear why dumping out a
version of git log into the release-notes is that useful.

doc/release-process.md

@@ -96,8 +96,6 @@ Open a draft of the release notes for collaborative editing at https://github.co
 
 For the period during which the notes are being edited on the wiki, the version on the branch should be wiped and replaced with a link to the wiki which should be used for all announcements until `-final`.
 
-Generate the change log. As this is a huge amount of work to do manually, there is the `list-pulls` script to do a pre-sorting step based on github PR metadata. See the [documentation in the README.md](https://github.com/bitcoin-core/bitcoin-maintainer-tools/blob/master/README.md#list-pulls).
-
 Generate list of authors:
 
     git log --format='- %aN' v(current version, e.g. 24.0)..v(new version, e.g. 24.1) | sort -fiu