message: add doc to accessStream
diff: @@ -2,6 +2,9 @@ import { chain } from "./chain"
  import type { Stream } from "./definitions"
  import { environment } from "./environment"
  +/**
  + * Accesses the environment of the stream in the context of a stream.
  + */
  export function accessStream<S, R, E, A>(
  f: (r: R) => Stream<S, R, E, A>
  ): Stream<S, R, E, A> {
  