Update documentation with latest OpenAPI spec

Author: actions-user

openapi.json

@@ -5640,7 +5640,7 @@
           {
             "name" : "post_selection",
             "in" : "query",
-            "description" : "The selection of posts to return. Valid values are 'feed_size: [small|large|xl], feed_lang: [en|es|...|all]'. Default (if not specified) is 'feed_size: small, feed_lang: en'. Only top AI writers have access to large and xl size feeds.",
+            "description" : "The selection of posts to return. Valid values are 'feed_size: [small|large|xl|xxl], feed_lang: [en|es|...|all]'. Default (if not specified) is 'feed_size: small, feed_lang: en'. Only top AI writers have access to large, xl, and xxl size feeds.",
             "required" : false,
             "schema" : {
               "type" : "string"