Fix broken links in docs

[maanug-nv]

What does this PR do ?

Aimed to preserve the target content. i.e., old links for CP and Dist opt pointed to the technical detail pages.

Changelog

• Add specific line by line info of high level changes in this PR.

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Additional Information

• Related to # (issue)

Summary by CodeRabbit

• Documentation
  • Updated parallelisms documentation with references to the latest Megatron Core Developer Guide sections for Distributed Optimizer, Tensor Parallelism, and Context Parallelism features.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated three external documentation links in the Megatron Core developer guide to reflect new URL paths for distributed optimizer, tensor parallelism, and context parallelism resources.

Changes

Cohort / File(s)	Summary
Documentation Links docs/parallelisms.md	Updated three Megatron Core external documentation links to newer paths: distributed optimizer, tensor parallelism, and context parallelism references. Minor wording adjustments to reflect updated destination URLs.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

docs-only

Suggested reviewers

• cuichenx

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix broken links in docs' is directly related to and accurately summarizes the main change: updating three broken external documentation links in docs/parallelisms.md to their correct URLs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Test Results For Major Changes	✅ Passed	PR contains only minor documentation changes (URL updates in markdown file) with no impact on code behavior, performance, or numerics.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch maanug/fix-links

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