Webhooks access and permissions for triage by comment

[armchairlinguist]

Fixing a few issues where we don't clearly articulate requirements for feature support related to webhooks (particularly GitLab Free).

Fixes https://linear.app/semgrep/issue/TEC-492/ensure-webhooks-requirementssupport-are-properly-documented.

Please ensure

• A subject matter expert (SME) reviews the content
• A technical writer reviews the content or PR
• This change has no security implications or else you have pinged the security team
• Redirects are added if the PR changes page URLs
• If you have changed any header tag links (doc/#this-kind-of-anchor), update all instances of that link

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Adding a new documentation page? Click to expand the checklist

• Create .md or .mdx file in /docs/[section]/ with frontmatter: slug, title, description, displayed_sidebar, tags
• Add page to appropriate sidebar in /sidebars.js (shows in side nav)
• If adding the doc in a new directory: Update /src/theme/Navbar/Content/index.tsx → add path to getCurrentSection() (highlights top nav)

Sidebars fields for displayed_sidebar:
scanSidebar | rulewritingSidebar | devSidebar | learnSidebar | aboutSidebar | kbSidebar | whatsSemgrepSidebar

Top nav fields for getCurrentSection():
'scan' | 'write-rules' | 'learning-guides' | 'help' | 'explore'

[netlify]

✅ Don't forget to add /docs at the end of the deploy preview site URL!

Name	Link
🔨 Latest commit	669cf3c
🔍 Latest deploy log	https://app.netlify.com/projects/semgrep-docs-prod/deploys/695f13168332550008d17b24
😎 Deploy Preview	https://deploy-preview-2453--semgrep-docs-prod.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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