chore(docs): Minor updates for NSG, routing profiles, and boot order

[bcavnvidia]

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Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

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📥 Commits

Reviewing files that changed from the base of the PR and between e6ca959 and e7c795f.

📒 Files selected for processing (1)

• docs/manuals/networking/network_security_groups.md

✅ Files skipped from review due to trivial changes (1)

• docs/manuals/networking/network_security_groups.md

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Summary by CodeRabbit

• Documentation
  • Clarified network security group behavior for optional caller-supplied IDs, including how collisions are handled and what to do when a 409 Conflict occurs.
  • Updated VPC routing notes to reflect that default network virtualization settings vary by site setup and interface, and to recommend explicitly specifying FNN for production.
  • Expanded troubleshooting for boot interface/device changes after DPU replacement, including Dell/VPI scenarios and recommended checks and next steps.

Walkthrough

This PR updates documentation for NSG id handling, VPC network virtualization defaults, and DPU boot-interface troubleshooting after replacement.

Changes

Documentation Updates

Layer / File(s)	Summary
NSG id collision documentation docs/manuals/networking/network_security_groups.md	Clarifies optional caller-supplied NSG id behavior, returned id values, and 409 Conflict handling when an id collides.
VPC virtualization default clarification docs/manuals/vpc/vpc_routing_profiles.md	Replaces the single default virtualization claim with site- and interface-dependent behavior and recommends explicit FNN for production.
DPU boot-interface troubleshooting entry docs/provisioning/boot-interfaces-and-dpu-modes.md	Adds a troubleshooting row for boot-interface loss after DPU replacement, including normalization checks and re-ingest fallback.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• NVIDIA/infra-controller#2797: Both changes extend troubleshooting and boot-interface guidance in docs/provisioning/boot-interfaces-and-dpu-modes.md.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the documentation updates across NSG, routing profiles, and boot order.
Description check	✅ Passed	The description is related to the changeset and correctly classifies it as an internal docs update.
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.

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[polarweasel]

One small change, then GTG!