[error-tracking] List possible includes in API doc (#2948)

Co-authored-by: ci.datadog-api-spec <[email protected]>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v2/openapi.yaml

@@ -449,7 +449,7 @@ components:
         type: string
     GetIssueIncludeQueryParameter:
       description: Comma-separated list of relationship objects that should be included
-        in the response.
+        in the response. Possible values are `assignee`, `case`, and `team_owners`.
       explode: false
       in: query
       name: include
@@ -996,7 +996,8 @@ components:
         $ref: '#/components/schemas/ServiceDefinitionSchemaVersions'
     SearchIssuesIncludeQueryParameter:
       description: Comma-separated list of relationship objects that should be included
-        in the response.
+        in the response. Possible values are `issue`, `issue.assignee`, `issue.case`,
+        and `issue.team_owners`.
       explode: false
       in: query
       name: include

src/datadog_api_client/v2/api/error_tracking_api.py

@@ -189,7 +189,7 @@ def get_issue(
 
         :param issue_id: The identifier of the issue.
         :type issue_id: str
-        :param include: Comma-separated list of relationship objects that should be included in the response.
+        :param include: Comma-separated list of relationship objects that should be included in the response. Possible values are ``assignee`` , ``case`` , and ``team_owners``.
         :type include: [GetIssueIncludeQueryParameterItem], optional
         :rtype: IssueResponse
         """
@@ -213,7 +213,7 @@ def search_issues(
 
         :param body: Search issues request payload.
         :type body: IssuesSearchRequest
-        :param include: Comma-separated list of relationship objects that should be included in the response.
+        :param include: Comma-separated list of relationship objects that should be included in the response. Possible values are ``issue`` , ``issue.assignee`` , ``issue.case`` , and ``issue.team_owners``.
         :type include: [SearchIssuesIncludeQueryParameterItem], optional
         :rtype: IssuesSearchResponse
         """