Fix spec links in README (#40711)
Fix spec links in README (#40711)

* Fix spec links in README

I forgot to update them.

* specify that the spec is archived
microsoft/TypeScript,kitsonk/TypeScript,microsoft/TypeScript,Microsoft/TypeScript,RyanCavanaugh/TypeScript,weswigham/TypeScript,SaschaNaz/TypeScript,RyanCavanaugh/TypeScript,SaschaNaz/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,kpreisser/TypeScript,kpreisser/TypeScript,SaschaNaz/TypeScript,kitsonk/TypeScript,weswigham/TypeScript,kitsonk/TypeScript,microsoft/TypeScript,kpreisser/TypeScript,Microsoft/TypeScript,RyanCavanaugh/TypeScript,Microsoft/TypeScript