message: doc(api) Add missing documentation for `from_export`.
diff: @@ -42,6 +42,7 @@ impl Extern {
  }
  }
  + /// Create an `Extern` from an `Export`.
  pub fn from_export(store: &Store, export: Export) -> Extern {
  match export {
  Export::Function(f) => Extern::Function(Function::from_export(store, f)),
  