Vault: fix logshipper_buffer_lengthq value

[stellarsquall]

Description

This PR fixes the default value for logshipper_buffer_length on the Tune server performance page, which should be 16384, not zero.

Links

Jira: SPE-1375

Contributor checklists

Review urgency:

• ASAP: Bug fixes, broken content, imminent releases
• 3 days: Small changes, easy reviews
• 1 week: Default expectation
• Best effort: No urgency

Pull request:

• Verify that the PR is set to merge into the correct base branch
• Verify that all status checks passed
• Verify that the preview environment deployed successfully
• Add additional reviewers if they are not part of assigned groups

Content:

• I added redirects for any moved or removed pages
• I followed the Education style guide
• I looked at the local or Vercel build to make sure the content rendered correctly

Reviewer checklist

• This PR is set to merge into the correct base branch.
• The content does not contain technical inaccuracies.
• The content follows the Education content and style guides.
• I have verified and tested changes to instructions for end users.

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Vercel Previews Deployed

Name	Status	Preview	Updated (UTC)
Dev Portal	✅ Ready (Inspect)	Visit Preview	Wed Nov 26 18:33:12 UTC 2025
Unified Docs API	✅ Ready (Inspect)	Visit Preview	Wed Nov 26 18:26:34 UTC 2025

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