docs: fix description of feedOptions.xslt (#10687)

* Fix description of `feedOptions.xslt`

* Update website/docs/api/plugins/plugin-content-blog.mdx

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Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

website/docs/api/plugins/plugin-content-blog.mdx

@@ -77,7 +77,7 @@ Accepted fields:
 | `feedOptions.title` | `string` | `siteConfig.title` | Title of the feed. |
 | `feedOptions.description` | `string` | <code>\`$\{siteConfig.title} Blog\`</code> | Description of the feed. |
 | `feedOptions.copyright` | `string` | `undefined` | Copyright message. |
-| `feedOptions.xslt` | <code>boolean \| [FeedXSLTOptions](#FeedXSLTOptions)</code> | `undefined` | Copyright message. |
+| `feedOptions.xslt` | <code>boolean \| [FeedXSLTOptions](#FeedXSLTOptions)</code> | `undefined` | Permits to style the blog XML feeds with XSLT so that browsers render them nicely. |
 | `feedOptions.language` | `string` (See [documentation](http://www.w3.org/TR/REC-html40/struct/dirlang.html#langcodes) for possible values) | `undefined` | Language metadata of the feed. |
 | `sortPosts` | <code>'descending' \| 'ascending' </code> | `'descending'` | Governs the direction of blog post sorting. |
 | `processBlogPosts` | <code>[ProcessBlogPostsFn](#ProcessBlogPostsFn)</code> | `undefined` | An optional function which can be used to transform blog posts (filter, modify, delete, etc...). |