[All] Bump minimum supported cuDNN version to 9.11

[cyanguwa]

Description

This PR raises the minimum supported cuDNN version from 9.3 to 9.11 in Transformer Engine. 9.11 is about a year old and we encourage users to update their cuDNN version if they haven't.

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Infra/Build change
• Code refactoring

Changes

• README.rst: bump documented minimum cuDNN under System Requirements from 9.3+ to 9.11+.
• docs/installation.rst: bump the cuDNN prerequisite from cuDNN 9.3 or later to cuDNN 9.11 or later.

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[greptile-apps]

Greptile Summary

This PR updates the documented minimum cuDNN requirement from 9.3 to 9.11 across the two user-facing prerequisite sections, reflecting that 9.11 is now the baseline the team recommends and supports.

• README.rst: System Requirements table updated from cuDNN: 9.3+ to cuDNN: 9.11+.
• docs/installation.rst: Prerequisites list item 4 updated from cuDNN 9.3 to cuDNN 9.11, keeping the existing hyperlink to the cuDNN download page.

Confidence Score: 5/5

Documentation-only change touching two lines across two files; no runtime logic, build scripts, or version-enforcement code is modified.

Both changed lines are plain-text prerequisite statements. The two files are consistent with each other, and the rest of the codebase (CMake find-module, runtime version guards) does not enforce the old 9.3 floor in a way that would conflict with this update.

No files require special attention.

Important Files Changed

Filename	Overview
README.rst	One-line update to the System Requirements table, changing cuDNN minimum from 9.3+ to 9.11+.
docs/installation.rst	One-line update to the Prerequisites list, changing cuDNN hyperlink anchor and text from 9.3 to 9.11.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User installs Transformer Engine] --> B{cuDNN version check}
    B -->|cuDNN < 9.11| C[❌ Below documented minimum\nupgrade required per README / docs]
    B -->|cuDNN >= 9.11| D[✅ Meets new minimum requirement]

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_{Reviews (2): Last reviewed commit: "Merge branch 'main' into update-min-cudn..." | Re-trigger Greptile}