Cherry pick `Fix example configs (11571)` into `r2.1.0`
<!-- pylint-output-strict-mode-true -->

beep boop 🤖: 🚨 The following files must be fixed before merge!

---

Your code was analyzed with PyLint. The following annotations have been identified:

```
************* Module pretraining
scripts/llm/pretraining.py:35:0: C0301: Line too long (151/119) (line-too-long)
scripts/llm/pretraining.py:144:0: C0301: Line too long (142/119) (line-too-long)
scripts/llm/pretraining.py:29:0: C0116: Missing function or method docstring (missing-function-docstring)
scripts/llm/pretraining.py:59:0: C0116: Missing function or method docstring (missing-function-docstring)
scripts/llm/pretraining.py:119:0: C0116: Missing function or method docstring (missing-function-docstring)
scripts/llm/pretraining.py:134:0: C0116: Missing function or method docstring (missing-function-docstring)
scripts/llm/pretraining.py:22:0: W0611: Unused Any imported from typing (unused-import)

-----------------------------------
Your code has been rated at 8.73/10
```

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Thank you for improving NeMo's documentation! Already merged cherrypick in different PR
beep boop [🤖]: Hi @BoxiangW 👋,
    
    we've cherry picked #11571 into  for you! 🚀
    
    Please review and approve this cherry pick by your convenience!