docs(sglang): update HiCache requirements

[jthomson04]

Overview:

Update the SGLang HiCache guide to replace stale PR-branch build instructions with released version requirements. The guide now distinguishes the SGLang version needed for host-tier KV events from the version that bundles the relevant Mooncake crash fix.

Details:

• SGLang 0.5.11 is the minimum version for tier-aware shared-cache routing because it includes SGLang PR #22894 and emits CPU_PINNED host-tier events.
• SGLang 0.5.11 through 0.5.12.x bundle Mooncake 0.3.10.post2, which is affected by the MemcpyWorkerPool crash documented in the setup warning. SGLang 0.5.13 and later bundle Mooncake 0.3.11.post1 with the upstream fix.
• The Dynamo 1.3.0 SGLang runtime image ships SGLang 0.5.14 and satisfies both requirements.
• Verification and troubleshooting guidance now uses version checks and upgrades instead of directing users to build an unmerged PR branch.

Where should the reviewer start?

Review the Requirements, Setup, Verification, and Troubleshooting sections in docs/backends/sglang/sglang-hicache.md.

Related Issues

🔗 This PR is linked to an issue:

• Relates to DYN-3352

Validation

• git diff --check
• fern check --warnings (0 errors; 2 unrelated repository-level warnings)
• fern docs broken-links

[datadog-official]

⚠️ Warnings

🚦 1 Pipeline job failed

Lint PR | Validate PR title and add label     

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: d2e5b99 | Docs | Give us feedback!}

[github-actions]

🌿 Fern Docs Preview: https://nvidia-preview-019f2448-8ce3-77d3-9bf1-eff3269460f3.docs.buildwithfern.com/dynamo/dev

[devin-ai-integration]

Devin Review found 1 potential issue.

[coderabbitai]

Walkthrough

Documentation for SGLang HiCache tier-aware routing is updated to state the required change (PR #22894) is available in SGLang 0.5.14+, replacing prior guidance about building from the PR branch, and removes a 1.2.0 known-limitation warning.

Changes

HiCache Documentation Update

Layer / File(s)	Summary
Version requirement and troubleshooting updates docs/backends/sglang/sglang-hicache.md	Requirements, Setup, Verification, and Troubleshooting sections are revised to reference SGLang 0.5.14+ instead of requiring a build from PR #22894's branch, and the 1.2.0 crash limitation warning is removed.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Related Issues: None specified.

Related PRs: None specified.

Suggested labels: documentation

Suggested reviewers: None specified.

Poem:
A rabbit hopped through docs so neat,
Old PR-branch notes deleted, complete.
Now 0.5.14 leads the way,
No more crashes to keep at bay.
Hop, hop—the cache tiers align today! 🐇

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately reflects the main change to HiCache requirements.
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.
Description check	✅ Passed	The description includes all required sections with clear summary, details, review location, related issue, and validation notes.

---

_{Comment @coderabbitai help to get the list of available commands.}