[error-tracking] List possible includes in API doc (#2775)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

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

lib/datadog_api_client/v2/api/error_tracking_api.rb

@@ -102,7 +102,7 @@ def get_issue(issue_id, opts = {})
     #
     # @param issue_id [String] The identifier of the issue.
     # @param opts [Hash] the optional parameters
-    # @option opts [Array<GetIssueIncludeQueryParameterItem>] :include Comma-separated list of relationship objects that should be included in the response.
+    # @option opts [Array<GetIssueIncludeQueryParameterItem>] :include Comma-separated list of relationship objects that should be included in the response. Possible values are `assignee`, `case`, and `team_owners`.
     # @return [Array<(IssueResponse, Integer, Hash)>] IssueResponse data, response status code and response headers
     def get_issue_with_http_info(issue_id, opts = {})
 
@@ -169,7 +169,7 @@ def search_issues(body, opts = {})
     #
     # @param body [IssuesSearchRequest] Search issues request payload.
     # @param opts [Hash] the optional parameters
-    # @option opts [Array<SearchIssuesIncludeQueryParameterItem>] :include Comma-separated list of relationship objects that should be included in the response.
+    # @option opts [Array<SearchIssuesIncludeQueryParameterItem>] :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`.
     # @return [Array<(IssuesSearchResponse, Integer, Hash)>] IssuesSearchResponse data, response status code and response headers
     def search_issues_with_http_info(body, opts = {})