Correct category description field description (#536)

## What changed?
* Correct category description field description

## Release notes draft
* Corrected the description of the category description field in the API
docs.

Author: bobbyshaw

reference/catalog/categories_catalog.v3.yml

@@ -262,7 +262,7 @@ paths:
                 description:
                   type: string
                   description: |
-                    The product description, which can include HTML formatting.
+                    The category description, which can include HTML formatting.
                   example: <p>We offer a wide variety of products perfect for relaxing</p>
                 views:
                   type: integer