title: What is one standard way to document a Context provider in React.js
body: <p>I am writing a Context provider in React.js, and am stuck when it comes to documenting it. Is there a standard way to do that?
  What I'm looking for is something similar to component documentation using PropTypes, where you put comments on top of each <code>prop-type</code>, as well as on top of the component's definition.
  It is preferable if the solution is supported by <code>react-storybook</code></p>