AWS prescriptive-guidance documentation change
Summary
Renamed from welcome.md to introduction.md; updated links, removed document history and date, edited content for clarity and formatting (e.g., changed quotes, removed affiliation details, adjusted risk terminology formatting).
Security assessment
Changes are editorial (renaming, formatting, link updates) and conceptual (refining definitions of downside/upside risk). No evidence of addressing a specific vulnerability, incident, or weakness. Content remains strategic guidance about risk perspectives.