[TRTLLM-11484][doc] VisualGen separate out quantized-attention.md

[xrq-phys]

Summary

• Added beta documentation for VisualGen quantized attention.
• Documented supported backends, recipes, configuration, tuning, and feature interactions.
• Flattened VisualGen feature documentation links.
• Updated CUDA Graphs, Sparse Attention, and related blog references.

Dev Engineer Review

• Changed links point to the new visualgen-* documentation paths.
• Documentation-only scope is appropriate.
• No code, API, configuration, or test-list changes were identified.
• Some unrelated documentation still contains legacy sparse-attention links.

QA Engineer Review

No test changes.

Description

Create quantization-attention.md to better list supported quantized attention variants & how to configure them

Test Coverage

N/A

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📒 Files selected for processing (6)

• docs/source/blogs/tech_blog/blog28_Accelerating_Video_Generation_with_GEMM_Quantization_Attention_Quantization_and_Skip_Softmax_Attention_in_TensorRT-LLM.md
• docs/source/index.rst
• docs/source/models/visual-generation.md
• docs/source/visual-gen/features/visualgen-cuda-graph.md
• docs/source/visual-gen/features/visualgen-quantized-attention.md
• docs/source/visual-gen/features/visualgen-sparse-attention.md

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• docs/source/models/visual-generation.md

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Walkthrough

The PR reorganizes VisualGen documentation links, adds a quantized attention guide, and marks CUDA Graphs and sparse attention documentation as beta. Related blog and model references now use the current guide paths.

Changes

VisualGen feature documentation

Layer / File(s)	Summary
VisualGen feature navigation docs/source/index.rst, docs/source/models/visual-generation.md, docs/source/blogs/tech_blog/...	The documentation index, model guide, and technical blog now reference the separate VisualGen feature pages and current visualgen-* paths.
Quantized attention guide docs/source/visual-gen/features/visualgen-quantized-attention.md	Added backend recipes, configuration examples, hardware requirements, validation behavior, tuning guidance, and compatibility notes for quantized attention.
Beta feature status docs/source/visual-gen/features/visualgen-cuda-graph.md, docs/source/visual-gen/features/visualgen-sparse-attention.md	Updated both pages with beta-status notes and corrected their cross-references.7

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 2dedb

This updates VisualGen feature documentation and links without changing runtime behavior. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the VisualGen documentation change and the separation of quantized-attention guidance into its own document.
Description check	✅ Passed	The description includes the required Description, Test Coverage, and PR Checklist sections. It explains the documentation purpose and correctly marks test coverage as not applicable for this document…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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Actionable comments posted: 4

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Inline comments:
In `@docs/source/models/visual-generation.md`:
- Line 216: Update the VisualGen quantization documentation wording to describe
“multiple backend-specific quantized-attention recipes” rather than two presets,
while preserving the existing configuration symbols, independent-enablement
guidance, and linked guide reference.

In `@docs/source/visual-gen/features/quantized-attention.md`:
- Line 50: Update the quantized-attention documentation statement around Q and K
to remove the unsupported FP16 claim and describe BF16 only, unless a valid FP16
recipe is also added to the relevant qk_dtype configuration and CUTEDSL_RECIPES
validator.
- Line 17: Update the model-support claim in the quantized-attention
introduction to qualify that the recipe applies only to models compatible with
the selected backend and its hardware, head-dimension, attention-shape, and
sequence-length constraints; retain the existing distinction between activation
quantization and checkpoint weight quantization.
- Line 12: Update the table-of-contents link for the MXFP8/NVFP4 section to use
the heading-generated anchor mxfp8--nvfp4-cutedsl--flashinfer, so it navigates
to the heading correctly.

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[zhenhuaw-me]

Thanks for adding the doc for VisualGen! Does it make sense to add some context about how to tune the recipes? We can add some general description in this PR first.

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Actionable comments posted: 1

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Inline comments:
In @.gitignore:
- Line 72: Replace the negated .gitignore entry for
docs/source/visual-gen/features.rst with a direct ignore pattern so the
generated RST file remains ignored.

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• docs/source/index.rst
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• docs/source/visual-gen/features/sparse-attention.md

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[xrq-phys]

/bot skip --comment "VisualGen doc update. No code change"

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PR_Github #72094 [ skip ] triggered by Bot. Commit: 21251a4 Link to invocation

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PR_Github #72094 [ skip ] completed with state SUCCESS. Commit: 21251a4
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[xrq-phys]

/bot skip --comment "VisualGen doc update. No code change"

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PR_Github #72339 [ skip ] triggered by Bot. Commit: 2dedbf0 Link to invocation

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PR_Github #72339 [ skip ] completed with state SUCCESS. Commit: 2dedbf0
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[github-actions]

Automatically added "ci: full pre-merge approved" because this PR has satisfied the required GitHub review approvals. Unresolved review conversations and other required checks remain independent merge requirements.

[xrq-phys]

/bot skip --comment "VisualGen doc update. No code change"

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PR_Github #72412 [ skip ] triggered by Bot. Commit: 63c9f5e Link to invocation

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PR_Github #72412 [ skip ] completed with state SUCCESS. Commit: 63c9f5e
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[xrq-phys]

/bot skip --comment "VisualGen doc update. No code change"

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PR_Github #72616 [ skip ] triggered by Bot. Commit: 05c485e Link to invocation

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PR_Github #72616 [ skip ] completed with state SUCCESS. Commit: 05c485e
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[xrq-phys]

@zhenhuaw-me . I think we can merge this one and rebase #18075 & #18496 after this.

thanks!