fix(docs): fix version regex in assemble-versions.sh to match major.minor dirs

The regex '^[0-9]+$' only matched pure integers but version directories
are major.minor (e.g. 1.60). This caused the "promote to latest" step
to find nothing, breaking the latest symlink. Updated to match the
original generate.sh pattern '^[0-9]+\.[0-9]+$'.

jira: trivial
risk: nonprod

Author: hkad98

scripts/assemble-versions.sh

@@ -36,7 +36,7 @@ echo "Removing master's latest directory"
 rm -rf "${content_dir:?}/latest"
 
 # 4. Find the highest numbered version and promote it to "latest"
-highest_version=$(ls -1 "./$content_dir/" | grep -E '^[0-9]+$' | sort -V | tail -n 1)
+highest_version=$(ls -1 "./$content_dir/" | grep -E '^[0-9]+\.[0-9]+$' | sort -V | tail -n 1)
 
 if [ -n "$highest_version" ]; then
     echo "Promoting version $highest_version to /latest"