Publish API for `Stdenv`.
Publish API for `Stdenv`.

`@private` hides classes from documentation altogether, while `@api
private` merely marks it as a private API.

Homebrew/brew,claui/brew,claui/brew,JCount/brew,Homebrew/brew,vitorgalvao/brew,EricFromCanada/brew,Homebrew/brew,nandub/brew,claui/brew,sjackman/homebrew,JCount/brew,JCount/brew,MikeMcQuaid/brew,EricFromCanada/brew,vitorgalvao/brew,sjackman/homebrew,MikeMcQuaid/brew,vitorgalvao/brew,EricFromCanada/brew,vitorgalvao/brew,nandub/brew,sjackman/homebrew,nandub/brew,nandub/brew,Homebrew/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,EricFromCanada/brew,JCount/brew,claui/brew,sjackman/homebrew