Updated the now-broken links to videos and slides PiperOrigin-RevId: 307687832
Ran g4 fix -v on the Guice wiki. PiperOrigin-RevId: 289944494
Update markdown files. - replace tabs with spaces - add new line before code snippets, list etc - fix links to other md files PiperOrigin-RevId: 289775884
Created ExternalDocumentation (markdown)