Fix FE-OSS SDPA links and DSA diagram fence

[pmdavies-nv]

Summary

• Replace broken SDPA Markdown anchor links in docs/fe-oss-apis/overview.md with stable docs.nvidia.com URLs.
• Mark the DSA architecture diagram code block as text in docs/fe-oss-apis/dsa.md.

Why

• The prior ../operations/Attention.md#... links do not resolve to intended section anchors in GitHub and were causing strict docs-build reference issues downstream.
• The untyped diagram block can be misinterpreted by syntax highlighters due to Unicode drawing characters.

Validation

• Built downstream docs with warnings treated as errors after applying equivalent fixes.

Summary by CodeRabbit

• Documentation
  • Clarified a code example formatting in the DSA docs for better readability.
  • Updated documentation links for SDPA Forward and SDPA Backward to point to the correct hosted references.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: a136e1e1-90e6-4aee-bd25-2702b4335372

📥 Commits

Reviewing files that changed from the base of the PR and between 6b6a822 and 832ac32.

📒 Files selected for processing (2)

• docs/fe-oss-apis/dsa.md
• docs/fe-oss-apis/overview.md

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📝 Walkthrough

Walkthrough

Minor documentation updates: a code fence in dsa.md now specifies the text language identifier, and two SDPA Forward/Backward links in overview.md were changed from local relative anchors to external NVIDIA documentation URLs.

Changes

Documentation edits

Layer / File(s)	Summary
Doc fence and link fixes docs/fe-oss-apis/dsa.md, docs/fe-oss-apis/overview.md	Code fence language identifier added in dsa.md; SDPA Forward/Backward links in overview.md updated to external NVIDIA docs URLs.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Related issues: None specified.

Related PRs: None specified.

Suggested labels: documentation

Suggested reviewers: None specified.

🐰 A hop through docs, both crisp and clean,
A fence now marked as text is seen,
Two links now point where NVIDIA lives,
A tidy patch, small joy it gives.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the two main doc fixes: SDPA link updates and the DSA diagram fence change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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