docs: update GitLens docs for v17.11.0

[Roberto-Vizcarra]

Backfill audit: v17.10.2..v17.11.0 (1 release, 123 commits)

Mode: backfill | Range: v17.10.2..v17.11.0

Findings (7 total)

Verdict	Finding	Pages
update-existing	logging-rewrite — commands renamed to "Debug (Trace) Logging", outputLevel deprecated	gitlens-faq.md, gitlens-features.md, gitlens-settings.md
update-existing	welcome-view-refactor — standalone Welcome view, not Quick Setup overlay	gitlens-settings.md
update-existing	ai-model-additions — Claude Sonnet 4.6, Opus 4.6, Gemini 3.1 Pro/Flash-Lite	gitlens-settings.md
add-section	submodule-support — new feature, zero prior coverage	gitlens-features.md
nothing	commit-composer-recompose-context — internal AI prompt improvement
nothing	stash-unstaged-fix — bug fix, no docs surface
nothing	internal-improvements — log scope refactor, LRU cache, async FS, rebase parser, etc.

Prose edits (6 across 3 pages)

• gitlens-faq.md:72 — command name updated to "Enable Debug (Trace) Logging"
• gitlens-features.md:1290-1291 — command names and descriptions updated
• gitlens-features.md — new "Git Submodule Support" section added
• gitlens-settings.md:1549-1550 — outputLevel marked deprecated
• gitlens-settings.md:1554 — showWelcomeOnInstall description updated
• gitlens-settings.md:1439+ — four new AI model values added

Deferred

• 15 images without specs (pre-existing, not introduced by v17.11.0)
• 10 images without alt text on actionable pages (pre-existing)
• Capture could not run — no VS Code/Xvfb in this environment
• All lint errors on edited pages are pre-existing (missing alt attributes, heading structure)