Specify where to find draft changelog in release process doc

Problem: The release process doc does not say where to find the
autogenerated draft of the changelog that should be used as a starting
point for the manual changelog.

Solution: Update the release process doc to describe where to find the
changelog draft.

Author: Kate Osborn

docs/release-process.md

@@ -47,8 +47,11 @@ To create a new release, follow these steps:
        [conformance tests Makefile](../conformance/Makefile) to `X.Y.Z`.
     7. Update the [README](../README.md) to include information about the release.
     8. Update the [changelog](../CHANGELOG.md). The changelog includes only important (from the user perspective)
-       changes to NKG. This is in contrast with the autogenerated full changelog, which is created in the next step. Use
-       the previous changelog entries for formatting and content guidance.
+       changes to NKG. This is in contrast with the autogenerated full changelog, which is created in the next step. As
+       a starting point, copy the important features, bug fixes, and dependencies from the autogenerated draft of the
+       full changelog. This draft can be found under
+       the [GitHub releases](https://github.com/nginxinc/nginx-kubernetes-gateway/releases) after the release branch is
+       created. Use the previous changelog entries for formatting and content guidance.
 7. Create and push the release tag in the format `vX.Y.Z`. As a result, the CI/CD pipeline will:
     - Build NKG container images with the release tag `X.Y.Z` and push it to the registry.
     - Package and publish the Helm chart to the registry.