chore: update release notes to 3.8.4

[peterbarnett03]

Small updates for the 3.8.4 release, as well as linting updates that were failing

[github-actions]

PR Preview Action v1.4.8
🚀 Deployed preview to https://influxdata.github.io/docs-v2/pr-preview/pr-6915/
on branch gh-pages at 2026-03-10 13:39 UTC

[github-actions]

Preview Pages for Review

2 page(s) changed in this PR:

Preview URLs

• /influxdb3/core/release-notes/
• /influxdb3/enterprise/release-notes/

---

@copilot please review the preview pages listed above using the template below:

Visual Review Prompt

Review the rendered documentation pages at the preview URLs listed below.
Check each page for visual and structural issues that are invisible in the
Markdown source.

Checklist

For each preview URL, verify:

• No raw shortcodes — No {{< or {{% syntax visible on the page
• No placeholder text — No PLACEHOLDER, TODO, FIXME, or
  template variables visible in rendered content
• Layout intact — No overlapping text, missing images, or collapsed
  sections
• Code blocks render correctly — No raw HTML fences or Markdown
  syntax visible inside code blocks
• Product names correct — Page header, breadcrumbs, and sidebar show
  the correct product name
• No 404s or errors — Page loads without error states
• Navigation correct — Sidebar entries link to the right pages and
  the page appears in the expected location

Output

Follow the shared review comment format, severity definitions, and label
mapping in
templates/review-comment.md.

Adapt the "Files Reviewed" section to list preview URLs instead of file
paths.

Preview URLs

• /influxdb3/core/release-notes/
• /influxdb3/enterprise/release-notes/