doc(catalog): CATALOG-11762 Upsert v3/catalog/trees endpoint has no limit on batch size (#1262)

Author: vil11

reference/catalog/category-trees_catalog.v3.yml

@@ -337,6 +337,7 @@ paths:
         **Usage Notes**
         * Channel ID in the `channels` field is required to create a category tree. You can only assign a category tree to one channel.
         * The `channels` field must be absent when updating a category tree. This field is currently unsupported during a category tree update.
+        * Batches are limited to 50 trees.
       parameters:
         - $ref: '#/components/parameters/ContentType'
       operationId: upsertCategoryTrees