fix(docs): change gatsby-config mention for global CSS import (#23245)

* fix `gatsby-config` mention

* chore: format

Co-authored-by: gatsbybot <mathews.kyle+gatsbybot@gmail.com>

docs/docs/recipes/styling-css.md

@@ -32,7 +32,7 @@ p {
 import "./src/styles/global.css"
 ```
 
-> **Note:** You can also make use of `require('./src/styles/global.css')` to import the global CSS file in your `gatsby-config.js` file.
+> **Note:** You can also make use of `require('./src/styles/global.css')` to import the global CSS file in your `gatsby-browser.js` file.
 
 3. Run `gatsby-develop` to observe the global styling being applied across your site.