AWS prescriptive-guidance documentation change
Summary
Renamed file from welcome.md to introduction.md and updated internal references. Removed document history date, standardized AWS service names and links, corrected punctuation, and removed redundant parentheses in URLs.
Security assessment
Changes are administrative (file rename) and editorial (link corrections, punctuation fixes). No security vulnerabilities, patches, or security-specific features are mentioned. Updates like changing 'AWS Transform MGN' to 'AWS Application Migration Service' are branding corrections without security implications.