What does this PR do ?

Correct the case on three Megatron-Core links to fix the linkchecker issue.

Collection: [Note which collection this PR will affect]

Changelog

• Correct three URLs in NeMo/docs/source/features/parallelisms.rst
• Added three URLs to the false positive list; they are slow to load, but do load
• Added NeMo Blog URL to false positive list for now, still needs to be looked at by @chtruong814 .
• Corrected two URLs that were redirecting in nemo/NeMo/docs/source/nlp/nlp_all.bib

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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• Bugfix
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Additional Information

• Matches other Megatron-Core links in NeMo/docs/source/checkpoints/dist_ckpt.rst and NeMo/examples/llm/resiliency/resiliency-in-pretraining-demo.ipynb