Rename 'Category' to 'Categories' in Listing your package documentation

#7654 The Schema says that it is Categories, whereas the description below it said Category.

Author: dinc5150

marketplace-and-integrations/marketplace/listing-your-package.md

@@ -113,7 +113,7 @@ The [schema for the JSON file is available](https://marketplace.umbraco.com/umbr
 | **AuthorDetails.ImageUrl**                       | String value     | A URL to a headshot or avatar image for the package developer (`.png` or `.jpg`). To use an existing GitHub avatar, use `https://github.com/{username}.png`                                                                                                                                                                                                                                                                         |
 | **AuthorDetails.Contributors**                   | Array of objects | A collection of key contributors can also be provided, each having a required name and an optional URL.                                                                                                                                                                                                                                                                                                                             |
 | **AuthorDetails.SyncContributorsFromRepository** | Boolean value    | If contributors are not explicitly provided, a GitHub repository is available in the 'RepositoryUrl' of the NuGet package. This option is set to `true`; the contributors will be synchronized from the GitHub repo.                                                                                                                                                                                                                |
-| **Category**                                     | String value     | The name of a single category as defined on the marketplace website. The package will be displayed under this category on the website.                                                                                                                                                                                                                                                                                              |
+| **Categories**                                   | String value     | The name of a single category as defined on the marketplace website. The package will be displayed under this category on the website.                                                                                                                                                                                                                                                                                              |
 | **Description**                                  | String value     | The package description. If omitted, the Description defined in the NuGet package details will be used. A short paragraph of text is recommended.                                                                                                                                                                                                                                                                                   |
 | **DocumentationUrl**                             | String value     | A URL to a the documentation related to the package.                                                                                                                                                                                                                                                                                                                                                                                |
 | **DiscussionForumUrl**                           | String value     | A URL to a discussion forum related to the package.                                                                                                                                                                                                                                                                                                                                                                                 |