docs: fix links to external plugin description

The links to the remark and rehype plugin creation documentation are broken.

website/docs/guides/markdown-features/markdown-features-plugins.mdx

@@ -121,7 +121,7 @@ If there isn't an existing package that satisfies your customization need, you c
 
 :::note
 
-The writeup below is **not** meant to be a comprehensive guide to creating a plugin, but just an illustration of how to make it work with Docusaurus. Visit the [Remark](https://github.com/remarkjs/remark/blob/main/doc/plugins.md#creating-plugins) or [Rehype](https://github.com/remarkjs/remark/blob/main/doc/plugins.md#creating-plugins) documentation for a more in-depth explanation of how they work.
+The writeup below is **not** meant to be a comprehensive guide to creating a plugin, but just an illustration of how to make it work with Docusaurus. Visit the [Remark](https://github.com/remarkjs/remark/blob/main/doc/plugins.md#create-plugins) or [Rehype](https://github.com/remarkjs/remark/blob/main/doc/plugins.md#create-plugins) documentation for a more in-depth explanation of how they work.
 
 :::