Add a more helpful docstring to schedule logic, scheduled test

src/documents/tasks.py

@@ -387,6 +387,18 @@ def empty_trash(doc_ids=None):
 
 @shared_task
 def check_scheduled_workflows():
+    """
+    Check and run all enabled scheduled workflows.
+
+    Scheduled triggers are evaluated based on a target date field (e.g. added, created, modified, or a custom date field),
+    combined with a day offset.
+
+    The offset is mathematically negated resulting in the following behavior:
+        - Positive offsets mean the workflow should trigger BEFORE the specified date (e.g., offset = +7 → trigger 7 days before)
+        - Negative offsets mean the workflow should trigger AFTER the specified date (e.g., offset = -7 → trigger 7 days after)
+
+    Once a document satisfies this condition, and recurring/non-recurring constraints are met, the workflow is run.
+    """
     scheduled_workflows: list[Workflow] = (
         Workflow.objects.filter(
             triggers__type=WorkflowTrigger.WorkflowTriggerType.SCHEDULED,