docs(specs): update api's length minimum value (#3574)

Author: Jerska

specs/common/schemas/SearchParams.yml

@@ -110,7 +110,7 @@ baseSearchParamsWithoutQuery:
     length:
       type: integer
       description: Number of hits to retrieve (used in combination with `offset`).
-      minimum: 1
+      minimum: 0
       maximum: 1000
       x-categories:
         - Pagination