Bug in batch script example for Intel Trace Analyzer and Collector

There seems to be a few bug in the [batch script example](https://hpc-docs.uni.lu/development/performance-debugging-tools/itac/#batch-mode) for Intel Trace Analyzer and Collector. Offending section:
```bash
$ export OMP_NUM_THREADS=16
$ -trace-collective ./a.out
```

- Source file: `docs/development/performance-debugging-tools/itac.md`