Redirect to the newer versioning model doc added

Author: anatoliykmetyuk

docs/docs/usage/version-numbers.md

@@ -3,6 +3,8 @@ layout: doc-page
 title: "Version numbers"
 ---
 
+**This documentation is outdated! Please find the newer version [here](/docs/contributing/release.html)**.
+
 Dotty uses multiple schemes for version numbering.
 
 Stable releases have version numbers of the form `0.${x}.${y}`, where `x` is a main version and `y` is a bug-fix update id.