**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).
const match = BLOG_POST_FILENAME_REGEX.exec(relativePath);
          const year = match[1];
          const month = match[2];
          const day = match[3];
          const filename = match[4];
          slug = `/blog/${year}/${month}/${day}/${filename}.html`;
          const date = new Date(year, month - 1, day);
          
          createNodeField({
            node,
            name: 'date',
            value: date.toJSON(),
          });
        }
      }
      if (!slug) {
        slug = `/${relativePath.replace('.md', '.html')}`;
        
        
        console.warn(
          `Warning: No slug found for "${relativePath}". Falling back to default "${slug}".`,
        );
      }
      
      createNodeField({
        node,
        name: 'slug',
        value: slug,