Clarify sort order of jobs api

doc/api/jobs.md

@@ -295,7 +295,8 @@ In GitLab 13.3 and later, this endpoint [returns data for any pipeline](pipeline
 including [child pipelines](../ci/parent_child_pipelines.md).
 
 In GitLab 13.5 and later, this endpoint does not return retried jobs in the response
-by default.
+by default. Additionally, jobs are sorted by ID in ascending order (oldest first).
+In earlier GitLab versions, jobs are sorted by ID in descending order (newest first).
 
 In GitLab 13.9 and later, this endpoint can include retried jobs in the response
 with `include_retried` set to `true`.