js/core: test-vdl-audit clarity
js/core: test-vdl-audit clarity

- Runs the command twice to preserve newlines
- Also mentions running `make gen-vdl` as the solution to the test failure

Change-Id: I3dabb05ef6bff7c0c040e5dc187bf2b20ac506c8

vanadium/js,vanadium/js,vanadium/js,vanadium/js