**Do you want to request a *feature* or report a *bug*?**
Bug

**What is the current behavior?**
The documentation for [warnings](https://github.com/facebook/react/tree/master/docs/warnings) returns a 404

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/ebsrpraL/).**
https://cl.ly/080p0f1t400y

**What is the expected behavior?**
Redirect to correct documentation.

~~**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**~~

---
The workaround is to look at the cached version from a google search or check for markdown [here](https://github.com/facebook/react/tree/master/docs/warnings).
*
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @emails react-core
*/
'use strict';
const {resolve} = require('path');
const webpack = require('webpack');
exports.modifyWebpackConfig = ({config, stage}) => {
  
  config.plugin('ignore', () => new webpack.IgnorePlugin(/^(xor|props)$/));
  config.merge({
    resolve: {
      root: resolve(__dirname, './src'),
      extensions: ['', '.js', '.jsx', '.json'],
    },
  });
  return config;
};
exports.createPages = async ({graphql, boundActionCreators}) => {
  const {createPage, createRedirect} = boundActionCreators;
  const blogTemplate = resolve('./src/templates/blog.js');
  const communityTemplate = resolve('./src/templates/community.js');
  const docsTemplate = resolve('./src/templates/docs.js');
  const tutorialTemplate = resolve('./src/templates/tutorial.js');
  const homeTemplate = resolve('./src/templates/home.js');
  const installationTemplate = resolve('./src/templates/installation.js');
  const allMarkdown = await graphql(
    `