Fix link to React Helmet on customizing html.js (#3074)

The link in React Helmet was resulting in a 404 because it was an absolute link to the same URL: `https://www.gatsbyjs.org/https://www.gatsbyjs.org/packages/gatsby-plugin-react-helmet/`
gatsbyjs · Nov 30, 2017 · 8340189 · 8340189
1 parent ad3220e
commit 8340189
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/docs/custom-html.md b/docs/docs/custom-html.md
@@ -25,7 +25,7 @@ Note: the various props that are rendered into pages _are_ required e.g.
 Also anything you render in the `html.js` component will _not_ be made "live" in
 the client like other components. If you want to dynamically update your
 `<head>` we recommend using
-[React Helmet](https://www.gatsbyjs.org/packages/gatsby-plugin-react-helmet/)
+[React Helmet](/packages/gatsby-plugin-react-helmet/)
 
 ### Target container