docs: document unstable icu sort order (#2948)

scripts/generate-locales.ts

@@ -298,6 +298,7 @@ async function normalizeLocaleFile(filePath: string, definitionKey: string) {
           // limit entries to 1k
           .slice(0, 1000)
           // sort entries alphabetically
+          // We cannot sort the entries locale aware as the sort order is not stable within node versions #2905
           .sort() as T
       );
     }