IBX-10527: Add a mention of Content Type Search REST API

Author: dabrt

docs/content_management/content_api/managing_content.md

@@ -170,10 +170,11 @@ To change the identifier of the copy, use a [`ContentTypeUpdateStruct`](/api/php
 You can find content types that match specific criteria by using the [`ContentTypeService::findContentTypes()`](/api/php_api/php_api_reference/classes/Ibexa-Contracts-Core-Repository-ContentTypeService.html#method_findContentTypes) method.
 This method accepts a `ContentTypeQuery` object that supports filtering and sorting by IDs, identifiers, group membership, and other criteria.
 
-!!! note "Criterions and sort clauses"
+!!! note "Criterions, sort clauses and REST APIs"
 
     For a full list of available criterions and sort clauses that you can use when finding and filtering content types, see [Content Type Search Criteria](content_type_criteria.md) and [Content Type Search Sort Clauses](content_type_sort_clauses.md) references.
 
+    For the REST API, see [Find content types](/api/rest_api/rest_api_reference/rest_api_reference.html#managing-content-find-content-types).
 
 The following example shows how you can use the criteria to find content types: