fix: correct glossary anchor links in campaign docs

[Copilot]

The docs build was failing due to broken internal links in the campaign documentation. The starlight-links-validator plugin caught invalid anchor references to the "GitHub Projects (Projects v2)" glossary entry.

Root cause: Markdown heading "GitHub Projects (Projects v2)" generates slug #github-projects-projects-v2, but links used #github-projects-projectsv2 (missing hyphen between "projects" and "v2").

Changes:

• Updated three anchor links in /docs/src/content/docs/guides/campaigns/index.mdx
  • Changed #github-projects-projectsv2 → #github-projects-projects-v2

-In practice, a campaign runs on a schedule, kicks off worker workflows in small batches, and tracks progress in [GitHub Projects](/gh-aw/reference/glossary/#github-projects-projectsv2).
+In practice, a campaign runs on a schedule, kicks off worker workflows in small batches, and tracks progress in [GitHub Projects](/gh-aw/reference/glossary/#github-projects-projects-v2).

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