Website/release: MESSAGE should be a one-liner

Author: dannywillems

website/docs/appendix/release-process.mdx

@@ -281,14 +281,7 @@ git checkout main
 git pull origin main
 
 # Create and push annotated tag
-make release-create-tag TAG=v1.5.0 MESSAGE="Release v1.5.0
-
-## Highlights
-- Feature 1: Description
-- Feature 2: Description
-- Bug fix: Description
-
-See CHANGELOG.md for complete details."
+make release-create-tag TAG=v1.5.0 MESSAGE="Release v1.5.0. See CHANGELOG.md for complete details."
 ```
 
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