Sync rendered _labs docs with updated lab READMEs to unblock Lab Doc Sync PR check

[Copilot]

Lab Doc Sync / Lab Doc Sync (pull_request) was failing because multiple labs/<slug>/README.md files changed without corresponding _labs/<slug>.md updates. The check is working as designed; the PR content was out of sync with rendered lab sources used by the site.

• Scope of fix: README ↔ rendered doc parity

  • Updated affected rendered lab docs to match recent README content edits so the sync gate no longer flags README-only changes.
  • Synced content for the labs implicated by the failing job (including agent-builder-m365, agent-builder-sharepoint, ask-me-anything, core-concepts-agent-knowledge-tools, mcs-orchestration, mcs-tools, and related _labs counterparts touched by the same update set).

• Content corrections folded into sync

  • Resolved markdown regressions introduced during content drift (broken image markdown, duplicate instructions, punctuation/grammar fixes, and wording clarity in procedural steps).
  • Restored missing instructional context in orchestration/tool-setup sections where it was unintentionally dropped.

• Behavioral impact

  • No workflow logic or script behavior changed.
  • Change is limited to rendered markdown content under _labs/, aligning source and rendered lab docs expected by the CI guard.

# CI guard this PR is satisfying
git diff --name-status --find-renames "${{ github.event.pull_request.base.sha }}...HEAD" \
  | node scripts/check-lab-sync.js