docs: fix typo in add-favicon-and-metadata.mdx (#89)

fix a type-o

Author: everdimension

src/docs/documentation/customizing/add-favicon-and-metadata.mdx

@@ -16,7 +16,7 @@ Adding metadata to your site is done by configuring Gatsby in combination with [
 
 The metadata is set up in a file called `wrapper.js` which lives in docz theme package: `gatsby-theme-docz`. To override it we need to [Shadow the component](https://www.gatsbyjs.org/blog/2019-04-29-component-shadowing/), which means that we need to create a copy of the file with the "same" file path and name in our own `src`-directory.
 
-1. Create a file called `wrapper.js` in `src/gatsby-theme-docz`. Then path is important.
+1. Create a file called `wrapper.js` in `src/gatsby-theme-docz`. The path is important.
 2. Paste the following content and edit it to your liking
 ```js
 import * as React from 'react'