Update webpack.md

Author: XhmikosR

site/docs/4.2/getting-started/webpack.md

@@ -36,7 +36,7 @@ to your `package.json` using `npm install --save jquery popper.js`.
 
 To enjoy the full potential of Bootstrap and customize it to your needs, use the source files as a part of your project's bundling process.
 
-First, create your own `_custom.scss` and use it to override the [built-in custom variables]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/options/). Then, use your main Sass file to import your custom variables, followed by Bootstrap:
+First, create your own `_custom.scss` and use it to override the [built-in custom variables]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/theming/). Then, use your main Sass file to import your custom variables, followed by Bootstrap:
 
 {% highlight scss %}
 @import "custom";