Description for Pageable parameters is not displayed in swagger-ui. Fixes #543.

Author: bnasslahsen

springdoc-openapi-data-rest/src/test/resources/results/app2.json

@@ -56,11 +56,6 @@
   "components": {
     "schemas": {
       "Pageable": {
-        "required": [
-          "page",
-          "size",
-          "sort"
-        ],
         "type": "object",
         "properties": {
           "page": {