Bugfix in migration prompt ./Z

prompts/migrate-module-Z.prompt.md

@@ -288,7 +288,7 @@ ctest --test-dir /repo/build-rti-on-grantlee-on --output-on-failure
 Also check whether this file exists and run it only if present:
 
 ```bash
-./docker-build.h
+./new_docker-build.h
 ```
 
 If it is absent or a typo, report that. Do not invent a replacement.
@@ -347,5 +347,5 @@ Keep it short. Include:
 - confirmation that removed modules were not restored
 - confirmation that LogViewer was preserved
 - exact validation commands and results
-- result of ./docker-build.h if present
+- result of new_docker-build.h if present
 - remaining blockers or risks